All in all, it is only fair to hate cheaters who have wronged us. People make all sorts of judgments but will bend the rules for someone who is their friend that happens to be a cheater as well. Take PH for example. There are some major cheaters in the forum. I won't drop names but the hint is that they're some of the most popular and well-liked PHers. These popular and seemingly friendly PHers are not only cheaters and home-wreckers but have done some very scandalous things that emotionally scarred their victims for life. If you knew about what they've done, you'd have a very low opinion about them. But seeing that they're so cool, nice, and non-contentious in PH, they've already seduced many of you to forgive them. You probably wouldn't care about their behavior (whether past or present) because you like the way you feel when chatting with them.
So in a nutshell, we only hate cheaters who have wronged us but we may even change our mind if they can seduce us to feeling good about ourselves.