This is why the web was better when everyone was operating under a pseudonym.
You only need to look at the kind of stuff the griefers on various other websites get up to to see the extent of the menu of real-world consequences. Those things are not jokes.
So I totally see your 'real consequences' argument, and it goes way beyond just your employment, in some cases it is your life that is in the balance.
But there will always be idiots. Just like there are people using drugs and then driving vehicles I have to share the road with them. But that won't change my attitude towards driving, and neither will the existence of assholes diminish my activities online. But I totally sympathize with those people for whom lines have been crossed that cause them to censor themselves or even to tune out completely. And I'm sure I too have such lines (in fact, I can easily think of several) and if those were crossed I too would bow out.