So, how many Palestinians do you authorize be killed in the defense of Israel? — Hanover
How many Israelis do you authorize be killed in defence of Gaza? Israel has destroyed half of the homes and displaced the majority of the people there. Israel is an existential threat to Gaza. Israeli politicians have said they want it wiped out. So whatever number you think is appropriate on the Palestinian side, you would have to logically concede a much larger number on the Israeli side if you are to play the "Country A has a right to defend itself (hidden premise: "by any means")" card. Otherwise you are again stuck in hypocrisy. The thing is you know that Gaza actually can't defend itself because of the overwhelmingly superior military force Israel has, and so you can feel comfortable making the argument.
So, yes, any country has the right to defend itself. But not "by any means". And getting people to agree to "Israel has a right to defend itself" as a cover for "Israel has a right to defend itself + by any means" is a rhetorical ploy that can justify not only Israeli war crimes but Hamas's war crimes too. If Gaza has "a right to defend itself + by any means" then future war crimes against Israel must also consistently be excused. That's the bind you're in. I'm not in that bind because I don't accept the hidden premise.
All defence must be proportionate. You are fighting an embedded guerilla force. When Britain was doing the same with the IRA, they also had a right to defend themselves but not "by any means". They did not do it by killing Catholic civilians en masse or bombing and destroying their homes
because that would have been madness and completely unacceptable. Instead, they did it by infiltrating and gathering intelligence on the IRA as well as beefing up their security systems so they could thwart IRA operations and negotiating in the background to make peace. This eventually worked. British civilian casualties remained relatively low, the IRA lost political support, and peace was achieved. If they had slaughtered babies in hospitals etc (regardless of their excuses) the IRA would have gained support including in the South of Ireland and in America, peace would have been impossible, more British civilians would have been killed, and Britain would have become an international pariah. That would have been stupid and self-destructive, right?
So, every argument you make of the form "Why should we have to take it"? "Why can't we defend ourselves"? etc can be applied to any situation where a dominant power is facing an embedded guerilla force and the "obvious" answer that you seek from your interlocutor ("Of course you must defend yourself", "You don't have to take it", "Do whatever you think you need to") actually turns out to be not so obvious or uncomplicated, certainly not ethical, and not how civilised countries should react in such a situation without major qualifications.
And remember, Gaza is not an existential or infrastructural threat to Israel. The military capability of Hamas is absolutely tiny compared to Israel. Netanyahu messed up by letting border security lapse and Hamas got through in a significant way and did absolutely horrible things, but they were almost immediately defeated and had to retreat. So, razing Gaza to the ground and killing thousands of its civilians is not justifiable. It's politically opportunistic, excessive and vengeful rather than necessary, proportionate, and ethical. Also, committing war crimes is always wrong. Cutting the electricity to incubators so babies suffocate to death is wrong. Bombing refugees on routes declared safe is wrong. None of that is part of a legitimate defence and constantly trying to evade responsibility by blaming Hamas for everything as if Israel did not wilfully choose those actions is not going to fly. The blame can be shared but not escaped. If anyone has agency here, it's the IDF. So repeating the line "Israel has a right to defend itself" gets you nowhere and in fact with the hidden premise ties you into excusing any atrocity that forms part of a reaction to an attack, including reactions by Hamas to the current attack by Israel. Not a good position to be in.