“Fletcher Christian: And why the heck should the West in general, and America specifically, help people who hate us?”

“Because it is the moral imperative of the religious tradition which underpins the West”

Not exactly. Let me quote Calvin in reference to the verses you quote and forgiveness in general, “when God commands us to wish well to our enemies, He does not therefore demand that we approve in them what He condemns, but only desires that our minds shall be purified from all hatred.”

He goes on to say that since there may be little hope of reconciliation, we do ourselves no great service by dwelling on our hate and need to just forgive and get on with things. That is not the same as demanding acceptance of or charity to those who harm us – something the Scriptures do not do. Especially when the offender is completely unrepentant.