I really liked your idea of communicating first. It can't hurt .... and if there is no reply or the reply given was altogether rude, then for heaven's sake blast the peep to smithereens.
Which is exactly what we did, as I said earlier...
As BigM was doing the scans, I was trying to hail him with simple questions about his intent in the system. He didn't respond.
So on the terms you've just given us, our actions were wholly justified.
Thanks for your support, CMDR o7