I know that many of those amateurs who have used community radio sites have had some kind of difficulty from time to time. It's hard to know what to do or who is at fault or who to talk to about an interference problem. A big problem can be lack of test equipment.
Many hams do.
They may feel the public service they are providing is worth the risk. Worse case is a general damage to the integrity of amateurs operating on community sites. At the risk of rambling, I will give you some examples. A site where I operate a two meter repeater came under some terrible interference from an unknown source. It was even wiping out the studio to transmitter link receivers for the FM stations at that location.