If Hamas rolled up onto the US border and fired 140 military rockets into El Paso, San Diego etc, the very same people who routinely call Israel fascist and evil would be quick to join the inevitable chorus of howling for retaliation.
Which people is it who routinely call Israel fascist and evil? Further, if Hamas "rolled up to the US border" and attacked, it would not be a remotely equivalent situation to that in Gaza. It is fallacy to present Israel as minding its own business until it is attacked. At the heart of this conflict is the fact that Israel is actively and continually engaged in the theft of Palestinian land.
Um... no they wouldn't. They'd call it a "humanitarian crisis" and demand that our government make citizens of them.