I don't think they'd be able to attack an entire town and escape unscathed. I believe they'd rethink their tactics after some of their blood is spilled. I'm confident that every small community has plenty of folks who'd rise to the occasion.
Attacking a single farm? They might succeed once or twice, but once the alert goes out, their party will be over.
Perhaps time to reinstitute the Minute Man program in the US.
