you do not need to trust a third party, only understand the system, decentralized, people's currency, POW, no borders, deflationary, fits in your phone, secure, semi-private, cheaper than traditional value exchange. Plus its just cool
Well we dont need to force people used bitcoin because we know that if people would understand how bitcoin works people would use anytime they want. So if people would used bitcoin it would be a reason for them that they don't need to get other ways to find money just in here at bitcoin and no need also to have a loan in any banks or corporate. And if people use bitcoin they will be in the right path for the future.
To stay compatible with each other, all users must use software created and operating under the same rules. Bitcoin can work only with full consensus among all users and therefore, users and developers have strong incentives to accept and protect this consensus