That’s a pretty loaded question. What do you mean by “support”?
I do support the Palestinian resistance—the right of Palestinians to resist occupation, the acts of resistance, the fight for resistance, the means of resistance. It just so happens that Hamas, qua Al-Qassam Brigades, is the largest and best equipped group providing armed resistance for Palestinians’ liberation from occupation in the Gaza Strip. In that sense, yes, I support Hamas and Al-Qassam, because they happen to be the ones who satisfy the description—and thus are in fact the ones being referred to by the description—“the leading resistance force that is standing up for and fighting for Palestinians’ liberation and freedom from occupation”. In a different possible world, some other political-military group would satisfy that description, and in that possible world I would support that group instead. I don’t support Hamas and Al-Qassam because they are Hamas and Al-Qassam; I support Hamas and Al-Qassam because they are leading the resistance.
Consequently, if you want to support the Palestinians in their resistance and their fight for liberation, freedom, and self determination, and you are not against armed and potentially violent resistance on principle, then you have to support Hamas and Al-Qassam in some sense, because they are leading the resistance right now. (Yes, with help from other groups such as Palestinian Islamic Jihad; but Hamas outnumbers them all by far.) If you refuse to support them, then your position is self-contradictory and you’re a hypocrite.
I know you might already be thinking, but what about their beliefs and ideology? I will get to that later, in a future essay. But suffice it to say at the moment that, for the most part, their beliefs and ideology are irrelevant.
[Just an fyi: I am not doing much editing and cleaning up of my writing, here and recently and in the near future, due to time constraints. Because when I do that for my writing, I am obsessive and perfectionist about it and it takes a long time; but these days, I just don’t have the time available for that kind of editing, and I’ve already spent way too many days writing this particular essay. So, yes, my writing is rather messy and rambling and disorganized and has some “stream-of-consciousness” feel to it.]