What did Netanyahu say the differences were between October 7 and the Holocaust?

The Nazis were able to kill more Jews than Hamas was because at the time of the Nazis there was no Israel to stop them.
Hamas was oppressed, the Nazis weren't
The goals of Hamas and Nazi Germany were different
He said the world is a lot more civilized today than it was during the Holocaust.

Is it a good idea for Israel to fight Hamas if it wants Hamas to release hostages?

Yes, Hamas will release hostages to save itself.
No, if Hamas is being shot at they will be angry and won't want to release hostages.

Is it in the best interest of the countries of the world that Israel wins in Gaza.

No, because there are a lot more Arabs in the world than Jews and the Arabs will turn against any country that supports Israel.
Yes, because if there is no Hamas left it can't attack Western countries.
No, because there have already been Arab terrorist attacks all over the world including the attacks of Sept 11 in the United States and so it won't make a difference if Israel wins against Hamas or not.
Yes because the enemies of Israel hate the West (Europe and America) and so any victory against Israeli's enemies is a victory for the West.
Yes because Iran may use Hamas against the West, especially if Iran is shielded by nuclear bombs.
Yes because Israel is fighting the battle of the West for western values such as freedom and against barbarism.

What do world leaders say to Prime Minister Netanyahu in private?

You've killed to many people, stop fighting Hamas.
We know your cause is just and you have to get rid of Hamas.