I tend to manipulate people
Why do you manipulate others?
I do it because I know what's good for them
Thinking that you know what is good for people is arrogant and manipulating people into following your way of thinking is just wrong. Leave others alone and worry about your own life.
It's fun to watch them do things they believe are right but that are wrong.
You shouldn't manipulate other people, and you certainly shouldn't convince them to do things that are wrong! You should apologize to the people who you've manipulated and get counseling to figure out why you like controlling other people.