If you don't hate evil, then you are not on the same page as Christ. (mathematically, two negatives can make a positive; hating

hate

(evil) = good

)
One thing that comes to mind is when Jesus entered the temple and saw the money changers turning God's house into a market, Jesus (probably not very happy with what he saw) put down his foot, and turned over the tables, and drove the money changers out with a whip. Now that is what you call "tough love".