The right equipment, a steady arm and good conditions and the most yellow-bellied of cowards could pick you off.
Would you really prefer those kinds of odds?
The logic here was just hilarious. That's like saying you could find the next Usain Bolt in every town you visit. Why do you even bother with these kind of people? I'm sure this idiot haven't fired a gun. It's a pretty tricky thing and 3.5 km with the wind (if we assume no obstacles between) is still going to seriously affect the shot.
Here is something to better spend your time on :-)
https://www.youtube.com/channel/UCP5tjEmvPItGyLhmjdwP7Ww/videos
I'm a glutton for it I suppose. Gun control offends me. There are millions of Americans with the skills and guns capable of shooting someone from hundreds of yards away and yet actual cases of anyone being sniped are rare.