God has been dealing with them since He became friends with Abraham. They drive Him nuts. And His punishment isn't a time-out in the corner. Slavery for 70 years wouldn't be my first choice of chastisement. On the other hand, there are times when the Jews brought about their own punishment and God allowed it.
It is stunning to know that before this is all over, 1/3 of the Jews will die, and of the remnant that remains, 1/3 of them will die also. But God will salvage members from all the tribes to carry on at His discretion, as He promised.
Every bit of it in God's hands, and He has even told us the particulars of the end time events. Every bit of it is by His will.
I wouldn't presume to tell God what I think He should do with the Jews or their enemies. My role in the mess is clearly defined. Pray for peace in Israel. And if I do, then, I can look forward to this:
I will bless them that bless you and curse those who curse you.