Slap a motive on someone for a crime -and the truth doesn’t matter if they can prove it. Fail to find a motive in the truth no matter how grim, but not yet discovered, doesn’t mean anything. The truth loses considerable weight. You’ve heard of a person going into a police station and confessing to a crime without a motive? Without evidence?
If you don’t think much of people
If you’re not very good at concealing it
If you’re not very good at disseminating your feelings towards the people in the world you don’t like from the rest of the world’s people
If you don’t have an extraordinary talent, you’re probably not gonna go very far in life -in the “people-world”.