If you took a look at the numerous government projects in the US that were officially revealed from the freedom of information act where they secretly experimented on civilians in all sorts of inhuman and permanently damaging ways (some ending with many deaths) you'd probably change your stance on that...

Also related to convincing other people of your opinions: not all your friends have to like what you like and hate what you hate. If they really like something and you really hate it, just let them enjoy it.

Only time you have to express that you don't like the thing is if they're trying to talk about it to you you can just politely say "dude sorry I'm really not interested in <insert name of thing>"