Alex Knapp questions the assumption that Hamas is an Iranian proxy:
...as far as I can determine from researching online, no such collaboration appears to exist. The best I could come up with is that Iran does provide some funding for Hamas, but that funding level is at a paltry $3 million per year. Saudi Arabia and Syria are much bigger funders of Hamas, and some Hamas leaders operate out of Syria. Even at that, though, it’s pretty clear that Hamas is pretty much a home-grown Palestinian organization. They may accept funding and support from other countries, but there’s not much evidence that they act as a “proxy” for any of them.
Alex dukes it out in the comments with readers who aren't buying it.