> Where do you think they've got the weapons from?

Ultimately, from the United States taxpayer. Who supply the Egyptian military government, who turn a small proportion over to the Islamists to keep them from too much rabble-rousing. Who smuggle them to Hamas.

Both Qatar and Iran supply money and other forms of support to Hamas. But no RPG makes it into Gaza (across a shorter than 10 mile border) without the Egyptian military sort of knowing about it.

And of course one of the reasons Qatar supplied them is because Netanyahu specifically asked them to. https://en.m.wikipedia.org/wiki/Israeli_support_for_Hamas