Turnabout is fair play

When Fatah and Hamas signed their unity deal back in early June, the European Union, the United Nations, the United States, China, India, Russia and Turkey all agreed to work with it, and ignored Israel's objections.  

Although Israel was completely against any unity deal that included an unreformed terror organization such as Hamas, everyone tried to sell it to us by pointing out that there were no actual Hamas members in the unity government's cabinet, and that once the unity deal was signed, Mahmoud Abbas and the Palestinian Authority would became responsible for both the West Bank and Gaza.

'Trust us', they said.  They assured us that the mechanics of the agreement would do away with the status quo whereby the Palestinians had two separate governments; one ruled by Fatah in the West Bank and the other by Hamas in the Gaza Strip, and would create a situation where the Palestinians spoke and acted with one voice.

So here's my question:

Now that the Palestinians (notice I'm no longer differentiating between Fatah and Hamas... as the unity deal is still very much in place), have committed a host of actionable war crimes, including (but not limited to) repeatedly:

• targeting Israeli civilians with missiles
• attempted kidnappings / terror attacks against Israeli civilians
• using Palestinian civilians as human shields
• storing and firing weapons from within schools, hospitals and mosques
• engaging in combat operations while wearing enemy (IDF) uniforms and insignia
• carrying out all of the above under a flag of truce / during a cease fire

... how is it that we aren't demanding that Mahmoud Abbas and the entire PA unity cabinet be brought before the International Court of Justice to answer for these war crimes?

It seems to me that if all the entities and countries I mentioned above gave us their assurances that Abbas and the PA Unity Government would now be solely responsible for the actions of the Palestinians... we should be able to hold them to that, no?

Forget the current and past Hamas leadership.  We can pick them off at our leisure in targeted strikes wherever and whenever we wish.  

But after all the years that Israeli government officials and senior IDF officers couldn't travel abroad for fear of being arrested and thrown into the dock at the Hague based on Palestinian accusations, isn't turnabout fair play?  

After all, if they can't be held to the agreements they sign with one another... how can they be expected to honor any agreements they may sign with us?!

Please show your work.