Israel has no right to exist. Period.
So what if God promised them this land? The Bible is not a legal document.
		
		
	 
The only way that position can be held is if you hold hatred of Jews above international law.
	
		
	
	
		
		
			Palestinians did not migrate by thousands from Russia and USA. They inhabited the land for years. How do you expect them to react when Jewish migrants take their homes and force them out of their land? Why should Arabs absorbe Palestinians into their countries?
		
		
	 
No Jews took Arab or Persian folks' lands until those folks cooperated with the invaders bent on genocide, then fled when the promises they'd been given failed to come to pass.  For all those who stayed, their property was still theirs, and they were citizens of Israel.
Today there is a problem with the settlements, with people pushed off their land without consent, but that's a detail compared to the broad brush you're sweeping with.
Why should Arabs let Arabs into their countries?  Well, because they made promises and commitments, for one thing, and when their war of extermination kept getting balked, they turned their backs on their brothers.  They caused the refugee situation, so they're responsible for ending it -- and that not by continuing their sixty-year-long war, but by turning from violence, recognizing human rights, teaching their people to live in peace, and inviting into their countries all the refugees they generated.
	
		
	
	
		
		
			Conclusion: As long as Israel exist, everything the Palestinians do is justified. No one would welcome a thief into his home.
		
		
	 
That's not a conclusion, it's a wild, propaganda-driven claim from diseased minds.  It's saying, "We want to commit genocide, because we decided we don't like these neighbors who came peacefully, so we can do anything we want as long as our enemy remains."
If Israel followed the "reasoning" you give when they look at the refugee territories, there wouldn't be a Gaza Strip, there wouldn't be a 'West Bank', there wouldn't be any refugees, because Israel would just line up the tanks and drive the length of Gaza, maybe letting anyone who could run fast enough make it to Egypt, and then they'd herd their enemies out of the hole in their country as well.