Hamas has been the government in Gaza for the last years, so I'm not sure what you want to say by stating the mass murdering by Hamas is a police problem.
18 years IIRC. Entire generation has been raised with one and single mission - destroy Israel. Yes Hamas isn't Palestine, same way Trump isn't America. But it's pretty damn close.
Stating that most Palestinian support the Hamas and their actions is a very big accusation, but your have not provided much evidence for that.
I have read some poll results from years ago and don't have deeper knowledge of the topic, just saying one would be to provide real evidence.
And that's only talking about Gaza. Since you said "Palestine" it should be mentioned that Hamas had not been able to dominate in the Westbank so far, so I don't think what you wrote is accurate.