Actually some people want to use their people for his own work in order to collect tax from them because tax is playing a very good role in revenue of any country but I don’t agree when some countries will be ban bitcoin I believe if they accept bitcoin in their countries so it can also play a very big role in their economy which can improve their economy and also it can reduced unemployment in these countries so they must accept bitcoin.

Again with this? Because they want to control you - and they can't do that with people going around free without paying them protection (taxes).

A ban might be because of the governments inability to control crypto currencies. They feel it could take over their economy and would eventually make them slaves to Bitcoin.

Hi there abd000! I think the problem in some country is that bitcoin can’t be controlled by their government and if there are something that can’t be controlled it could definitely be rouge and create damage to the economy. In terms of bitcoin in China, I think that is also the reason behind, and to protect it’s citizen. However, China always want to create their own, thus, bitcoin is included on those lists. But rumors said that China is preparing a good regulation about cryptocurrencies, and will then open it’s door again to crypto. 

There are several circumstances in which regulation or banning could come into play, each of which has certain drawbacks from the standpoint both of consumers of Bitcoin and regulators. There are certain ventures within the Bitcoin community which involve cooperation with mainstream banking entities, something that effectively "regularizes" the currency. This, which allows both easy entry and high volume transactions, also is the easiest to regulate, since banks are forced to be compliant with a great number of regulations. In this sense, the more normalized and regularized certain aspects of the Bitcoin economy become, the more vulnerable it is to regulation.
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The other tactic is to target Bitcoin partners, all of which by necessity have some sort of address (both literal and virtual). For example, large Bitcoin users like Silk Road could be aggressively targeted by law enforcement via raids and and confiscation of servers, etc. A second tier could be Bitcoin exchanges, suspected on account of being vehicles for money laundering (these charges are what led to the demise of previous digital currency companies DigiCash and E-Gold). 
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Actually banning Bitcoin is also a possibility. As noted by some Bitcoin experts, it is also possible that a nation-state could dedicate enough computing power to "break" Bitcoin. It could presumably ban Bitcoin as well, but again many things currently traded within the Bitcoin community (i.e. drugs) are also banned -- the more tricky thing is to determine what governments can actually enforce.

Banning Bitcoin would be similar to banning Tor or P2P. They can't ban it. Governments would have to track each connection and have spying software everywhere.
If someone would make Bitcoin illegal, probably all other virtual currencies would have to be treated same. That means any shops vouchers, points or video games currencies would have to be illegal. Each of those is virtual and potentially worthless (not represented by material goods).
If they don't ban all virtual currencies, there'd be quickly next currency similar to Bitcoin - 1 line of code added, name changed (i.e. Bitmoney). Hey, it's completely new currency! That doesn't matter that it has same rules as Bitcoin.

Bitcoin isn't evil as P2P isn't either. That are tools. People decide how to use them.

I would say that governments only ban Bitcoin out of sheer stupidity and let me elaborate on this stupid behavior in more detail.
1. Governments are in fear mode and in no way do they want to lose a grip on controlling their subjects.
2. Governments do not like change because most of the times they are corrupt. Bitcoin technology would render corrupt governments useless.
3. Banks work with Governments and they want to keep all the profits form trading and monetary issues for themselves and they don't like to share.
4. They think that most of us are stupid so if they see us all waking up, they know their time is over and they don't like that at all.

There are many other reasons why governments ban Bitcoin I would need to write a book to elaborate. 

Government ban bitcoin because they are threaten. Since bitcoin is a decentralize peer to peer network. The system doesn't require a third party in which the result would be losing its power to contol. With the presence of bitcoin, banking system will be irrelevant. It may dissolve the banking system. Lastly, tax on bitcoin (in my country) is not yet imposed by the government. If that's the case, the government benefit from bitcoin investments.

I think why some governments forbid? Perhaps because krypto money goes up and down with prices so some governments are afraid that if the government uses krypto money they worry if the state money can run out because they can not print paper money again after using krypto money.

You are right they  have found out new idea and that is producing their own coin just like China does, but since bitcoin has proven its stability I don't think that bitcoin will lose its power of being the number one cyrptocurency around the world. Just continue patronizing bitcoin and eventually bitcoin will grow more and those countries that banned bitcoin will eventually making it legal.