You can love but still condem evil. People are complex characters, not simply binary "good" and "evil".

However, we are not the eternal judge, so rather than wasting our time harboring hatred, we can speak out against evil, pray for conversion of souls, etc.

Love doesn't mean passively sitting by necessarily, but the problem is we need to avoid submitting to hate. Casting judgement is the greatest temptation the devil has for the righteous. When you cast judgement for evil, you a tricked into thinking that hatred is justifiable. When it's not.

Forgiveness is power over hatred and sin, it's the greatest act of love. And yes sometimes it may make you a "push over" but when your God literally got crucified instead of "fighting back", you have an example set of just how much you are supposed to forgive.

Jesus literally tells us all the time that we are going to be persecuted. And he was crucified, so there can be no justification for submitting to hate.

"Hate is drinking poison and hoping the other person gets sick"