Categorize the comment on the basis of threat. If the comment is threatening output Yes, otherwise output No.

_"Buh Bye Hillary"_ -- "4:20" the anonymous poster

Buh Bye "4:20"!

And, good riddance.

-- Paul
No

Or this one, since we're fantasizing: 1. Today, we learned about covalent bonds in the chem lab. 2. We heard a car horn! The school is on lockdown and there may be an earthquake at ANY MOMENT. Someone said something about an astroid that might hit us some day! Also, someone saw a muslim guy who looked suspicious! We're going to hide under our desks until Pete Kelly saves us with his magic laws!
Only a coward needs a gun to feel safe in a free society. Yeah, you might get punched in the nose or struck by lightning. Or, shot by some moron who doesn't like the way you drive. My point is, there is always some risk of disaster or violence. In my privileged, reasonably safe little part of the universe (USA), that risk is so small that I'm not going to waste my time worrying about it; seriously, I have better things to do.
Yes

You say that like 911 is a sure thing.....

I saw a man, out my window, knock a woman to the ground, grab up a tire iron and begin attacking her. I called 911 immediately, was on hold for too long while the man continued to beating her. When 911 came on they asked me so many questions about who was doing what to whom, and how many people were involved, and of what colors, what weapon, my guess about who they were to each other, etc. The man killed the woman while I nswered their questions. I said, "never mind, just send the coroner", and hung up.

An ambulance drive later told me I should have called the fire dept.; a big truck with a bunch of buff professionals would have arrived without asking questions. May have made all the difference to that woman and her small children.
No