Hamas is a bunch of evil people. That doesn't justify descending to their level of butchery to exterminate them, especially not when you are so much more efficient at that butchery.
> Israel has killed something like 30-40x the number of civilians in the same timeframe.
The one doing it
> They've just been denied the chance.
Perhaps. Perhaps if they somehow had the time, means and power to do it, they would have killed as many people on the other side, although this is high speculative as the past decades would have played out very differently anyway.
I'm not sure where you're going with that though. Nobody claims Hamas are kind and gently guys.