Re: Easy to Avoid
Typical sniper has to man his gun personally (not yet by proxy... yet).
Of more concern are urban areas, maybe a max bullet travel time of 1S more likely 0.5S or less.
Computer and mechanical response 0.5S
human response 1S (IFF, could be shorter with more complicated cameras)
Return fire 0.5-1S transit.
OK Mr Sniper you have 2.5-3.5S (and possibly as much as 1S less than that) from pulling the trigger to escaping The Wrath of Robo the Kid, of which 0.5S is likely wasted having to stabilize the gun. You also need to avoid the inevitable indirect fire lobbed grenade (in case you think an armored wall will help).
In free fire zones, the perp will typically only get a few meters, a lethal blast radius of 2-5M will probably exterminate the pest. Like rats they will get smarter though-- jump down 3 story deep holes in the building after firing, shoot from bus loads of orphans, etc..
But what I really want to know about Robo the Kid and his injun sidekick Steel Cloud is: what is the name of the steel horse he rides??