Politically incorrect is not evil, though it is certainly to the benefit of the politically correct to brand it such. The US separated state and faith to maximize personal freedom, but there are many benefits to uniting them - disobeying the state becomes a sin, so people are much more likely to obey.
People do avoid the term evil today. Instead, every evil act is blamed on insanity, ignorance, bad environment, inanimate objects or low intelligence.
This gives them the incorrect assumption that if they talked to everyone about the right ideas, banned the wrong ideas, banned some items - then the world would become perfect. This is an idealistic view, and it is wrong. It feels good to say that if only we'd told him about our ideas, he'd have never done those bad things - and that if we tell him our ideas, he'll never do bad again! It becomes an excuse to proselytize the liberal ideology, ban contrary views, deny personal responsibility for one's actions and makes rehab in theory easy.
Too many liberals cannot fathom that someone can be intelligent, sane, stable and educated and choose to commit what we consider great evil. The Germans were one of the most scientifically advanced nations in the world, and they decided to systematically eradicate Jews, atheists, homosexuals, Communists, Slavs. I read the people saying "just ban hate, end hate!" Yet the murderers didn't necessarily hate those they killed, saw it instead as improving society by eliminating those they've denied equal status to.
The same is true of many Muslim terrorists - Allah says this, I get these rewards, killing a few seemingly at random scares a hundred into converting. The greatest good in Islam is not life, as it is with Christianity, but conversions to Islam. Thus killing 10 to "save" 100 who convert out of fear is not only moral but highly moral. But it is easier and feels better to blame poverty, ignorance, insanity than a moral system utterly contradictory to ours ... up until they kill again.
But admitting the problem is an evil ideology or rational choice by someone to abandon morality for purely selfish reasons is frightening and forces one to admit it is MUCH harder to fight, and that it can't be fought by just talking to people or giving them a toke to fix it.