They should be made to rue the day.
For starters make em eat their own genitals. They are hyperfocused on crotches there - amazingly just like our own libtards here, like the universe revolves around their junk - so its kind of a fitting horrific start on the road to allah for them.
A lot of those civilians are also likely ISIS supporters.
Consider the ratio of front-line to rear echelon troops in modern militaries — it runs about 8:1 in favour of the rear echelon. That number does not include the multitudes that play other necessary supporting roles — finance, weapons making, etc.
Several thousand “civilians” there could be actively supporting ISIS fighters.
That said, I’m not a “let God sort them out” type of guy. The death of any innocent civilian is a tragedy, and they must be avoided if at all possible.