I don't understand assassination's

Playing base game on default difficulty, I keep getting assassinated before my first term.
As UK the Capitalists start hating you.
My first playthrough I didnt try to improve my rating with them so they assassinated me. ok fine my bad.
Second playthrough I make an effort to increase their happiness, my approval rate goes up with them but they still decide to assassinate me…
Third playthrough I prioritize Capitalists over everyone else, and increase my police/security. they still become a threat, although not as large, however another group starts to hate me and assassinates me…
I dont know what else i can try. Seems like a balance problem or im missing something?