Because they wont able to do so.If they able to kill BTC then they had already done it and thats why we do see lots of regulations and laws towards cryptocurrency but this decision would vary on each country since not all are on the same side.Some do support it and some do see it as a threat.

Government cant kill BTC even the creator itself wont able to do so and thats the beauty on dealing with Bitcoin market yet it has been supported by many and the price is dictated depending on the supply and demand.

For government on owning secretly then theres no surprise on that since theyve been holding specially to those coins which are been confiscated
on scam programs or even on that silkroad btc's.

Last, you cant compared Gold to BTC.

It either the government accept bitcoin or ban it. But, here is the fact, bitcoin will continue to thrive as a non centralized crypto.

I believe governments have started seeing the positive side of bitcoin.

If a government is not embracing bitcoin, they can only kick against it in their own country, they cannot stop it in other countries, bitcoin has come to stay. As a matter of fact they can only fight against it, they cannot even totally eradicate it, if only they will control the internet from entering people's room.
But to come to the fact, bitcoin is offering many what the government could not afford,it should be the joy of the government that citizens gain relief outside them.

Because even though they can outlaw it and make the ownership of BTC illegal, they really can't kill it. Just like how they can outlaw piracy and buying illegal stuff through the darknet markets, but they can't fully "kill" it.

^Not sure if this is the reason why they don't outlaw it though, they probably don't see it as that big of a threat yet.

Some countries are trying to ban btc while most have resorted to regulating exchanges and other services accepting btc transactions since they know they can't stop the mining and the nodes that supports the Bitcoin blockchain. If one country stops all mining operation in her jurisdiction, a one will start in another country.

Two of the latest countries who opted for regulations are India and Nigeria. More countries will follow soon once they realize they are falling behind and they're missing out on the opportunity to earn more from taxes.

No government can kill bitcoins because Bitcoin is decentralized on the internet and they are decentralized. If a user is banned in this country, the user will be in another country. Bitcoin liquidity at a global level. The government can only prohibit the use of Bitcoin as a means of payment, but cannot prohibit people from hoarding bitcoins because they do not have the authority to manage or oversee the bitcoin network. In countries that ban the use of bitcoin, people are quietly using it for transactions.

They can't do anything to Bitcoin. Even if they ban Bitcoin, there's still a chance that people would still use it secretly to transact. Also, why would they kill something that they would benefit from? just look at countries that is utilizing the potential of cryptocurrencies, they are taking advantage of the technology and because of it, it is helping their economy and their country grow.

From my perspective it seen that government don't have much authority to eradicate cryptoccurrency especially bitcoin due to cryptoccurrencies is decentralized and no one can come up and stabilized it without a proper strategies or evidence of corruption.
While them should protect the interest of bitcoin is because they have found out the benefit of bitcoin in society.

The only way to ever kill Bitcoin was if the internet was to be killed, and I mean in the ENTIRE world. It's like killing the air, you need to place the entire world in a vacuum to ever consider air "killed". Do you think they have enough authority to do as such? The most they can do is put a bad name into it, but that's it. Gold would still shine even if it was placed in a dirty place, so no matter what they do, Bitcoin would still be gold in the eyes of the few.

They aren't protecting it even, heck they can't even touch it. If they could, they would've as you said, killed it instead of protecting it. You can ask search engines for more braindead questions next time, you might not even need 5 minutes to look up a satisfying answer.

Spot on. I honestly no longer think that OP is seriously asking and just make new sensational threads for whatever reason. A few sentences with sensational questions and then no longer replying to the thread is the usual MO.