Y'know. There's a Bible story about how the literal sons of Israel (Jacob) tricked a guy into circumcising himself and his people as a gesture of goodwill. Then they came and slaughtered them all while they were in pain from the procedure.

Granted, they had legit reason to want the guy dead, him having raped their sister and all. But Jacob himself said it was a bad move and was only going to make their family seem untrustworthy and abhorrent to their neighbors.