That’s crazy because I’ve heard Israelis assert the exact opposite.

Yes, religious extremists exist also in Israel.

There’s a certain dramatic irony in funding UNRWA, paying Israel to bomb UNRWA, and then claiming you’re the only folks providing aid to Palestinians.

I’m not the one who wrote USA is the only one providing aid.
What you quoted is the reality. The bulk of the funding over the years has been from the USA and the EU.

So Palestinians are Hamas?
Why is Iran not helping Fatah?
Their support of Hamas is on ideological grounds. Israel is holy waqf land that belongs to Muslims and should be cleansed from Jews.

Even when Egypt had sovereignty over Gaza they made sure to prevent Palestinians from going to Egypt.

Tunnels from Lebanon… to Gaza…? Where’d you read that?
Hezbollah begun bombing Israel in support of Hamas. They’re also funded by Iran (much more than Hamas though).
Meanwhile Palestinians live in camps in Lebanon. Some of those walled and surrounded by watchtowers.
They have less rights there than anyone else (including refugees and migrant workers), despite living there for 3 generations at this point.

Turkey under Erdogan has been mostly hosting Hamas leaders while bombing Kurds in Syria.

I don’t think much needs to be said about Assad.

The only country in the area which actually helped Palestinians was Jordan. Although that also changed for a while after Black September.

Most of UNRWA’s funding over the years has come from the EU and USA.