World's major countries are behind this Bitcoin, but in the end they failed to control it.
This is one conspiracy theory that i have heard so many times, i wanted to tell you to take off your tinfoil hat, but if this is what you truly believe, then fine, i'll let you have your own opinion.
Bitcoin helps protect the privacy of your money. There may be some illegal activity involved in Bitcoin transactions, so I cannot question the validity of the coin. Where your money is private, no one can find out about your Bitcoin money,
The BTC blockchain is a public ledger, so there is no privacy in the BTC protocol, if you want privacy, you have to use BTC in addition with privacy solutions, i.e. mixers, coinjoin, BTC->XMR->BTC, etc. However, if you use BTC without a privacy tool, anyone can see your tx on the blockchain, but without your true identity.