The server I play on had an issue with a large group of Russians that would raid everyone and they would pick you off from a mile away with the rifles while they were in large groups.
I promptly built a small stash of C-4 slowly, tracked down their base, blew a hole in their wall while they were offline, only to find out that they built a huge open floorplan base. I promptly looted everything in multiple trips, walled the hell out of their base, and destroyed all of their sleeping bags/furnaces.
Keep in mind these guys did the same to other people that were not in any way hostile, so I felt zero remorse.
After that they rebuilt in a different location and I tracked them down and repeated my demo work, they haven’t logged on since.
The only way to deal with cowards/groups is to make them realize they’re just as vulnerable as you are.