Today most people against PC seem to be individuals who are pissed that we can't be publicly sexist and racist anymore without being criticized. PC is not a "tool" and is not enforced, it's simply the resonance of what society thinks today. People are still free to say whatever they want.
"have you ever seen someone get tazed for asking a question?" Even if that might be true, it doesn't seem to be about PC anymore. Getting tazed for saying something is not the same as verbal criticism.
If someone takes PC to the level of physically harming someone, he is a criminal. Criminals don't follow laws and they should have nothing to do with it. Violent people are not supported by PC people as far as I see it.
We DO have to measure intent. You can't just act as if every person would talk the same way. There are many public figures today whose only drawback when talking is being offensive to others. A good example is Trump calling an opponent a pig in a debate. Why defend him when he gets criticized?
Without any control, public figures would be able to say whatever they want. Be racist, make jokes about the holocaust, condone beating of women and insult opponents. It's still free speech but society should be free to criticize what other people say.
It's not about being honest, PC is about being able to shift focus to real issues and disregarding things like offending the opponent. For example, trump is a horrible candidate and likes to waste time talking about "raping mexican immigrants" and how another public figure is "a pig".