Yes, your beliefs shape how you act, so shitty beliefs will make you a shitty person. Not shitty all the time, but shitty often enough that anyone can point at the person and see it’s mainly due to the belief.
‘horrible’ is not a useful metric for human beings. It’s entirely subjective. If you want to define it as their net impact on the world (still pretty vague), then yes - negative actions are not counterbalanced by hypothetical good intentions
Yes, your beliefs shape how you act, so shitty beliefs will make you a shitty person. Not shitty all the time, but shitty often enough that anyone can point at the person and see it’s mainly due to the belief.
Some examples: racists, fascists, ancaps
Are they still horrible people if they’ve been brainwashed by conservative propaganda all their life?
‘horrible’ is not a useful metric for human beings. It’s entirely subjective. If you want to define it as their net impact on the world (still pretty vague), then yes - negative actions are not counterbalanced by hypothetical good intentions