Thanks gingejbee.....Just checked google and it seems they CAN be a friend! by aerating the soil-but if their colony is too close to the root system then that can be destructive!
I think it depends...I know they can be pollinators,which is a good thing, and I'm sure some of them do some bug patrolling. Around fruit trees, they can be annoying as they support aphids. Otherwise, they do a good job of turning soil.