You can only do that for specific situations. What if the criminal runs inside the building or grabs a person to shield himself from the sniper? Are you going to surround the person with snipers from every direction?

Also sounds like the cost for those snipers would be pretty high than manufacturing few drones to lock in a target and swarm under their head.

Cost of drones is only going to decrease while the cost of sustaining human life remains more or less the same if not increase.

A well-trained sniper that you can trust to cover a crowd needs a lot of training and time and money.

A drone is $30k