Source? Assuming that is true, they have the ability to vote.

There are some companies that go out of their way to employ them (Rami Levy and SodaStream are some of the largest). Unfortunately, extremists use this as an attack vector against innocent men, women, and children, as they exploit their jobs to be able to murder and maim civilians (https://en.wikipedia.org/wiki/2014_Jerusalem_synagogue_attac...).

Israel provides electricity to the PA even though they haven't paid their bill in years, and will probably never pay it in full. We're talking debts of $500M+ (http://www.timesofisrael.com/israel-pa-said-to-reach-deal-on...).

Palestinians have the potential for a very good life in Israel. Sure, there are extremists on both sides. However, Israel is not a country made up of extremists (in fact they are a tiny portion of the population). The key difference is that most Arabs support their extremists though they won't carry out acts of terror (centrists celebrate in the streets after terrorist attacks are carried out; most vocally support terrorism against Israel and the West even if they wouldn't do it themselves, and they would rather see Israel destroyed than have a two state solution implemented) [I know there are sources for this, but I can't seem to find them. I'll instead attribute this to my personal experience with this, and leave you to draw your own conclusions].

The way I see it, it's best summed up with a quote from Golda Meir (disputed, but accurate nonetheless):

“Peace will come when the Arabs will love their children more than they hate us.”