The חזקוני and שפתי חכמים deal with the בן סורר ומורה question. Yes, we do have a precedent for Gaza, it’s called עמלק. (Now I’ll wait for all the posts blasting me..)
Your position is indefensible. As I noted in my original post, עמלק, or any other exceptions in tanach, ARE EXCEPTIONS! Standing up for morality means standing up for it even when you're angry. I recall seeing a torah source (can't remember where, maybe someone can identify what I'm referring to) describing the mitzvah to erase amalek as the most difficult in the torah. It is reprehensible that you think you can (or that you'd even want to) go ahead and extrapolate that to Yishmael.
Incorrect. I heard from R’ Avigdor Miller Zt”l that “don’t think children are like animals, they possess a lot of intelligence and are judged in the heavenly scales accordingly. The reason they are patur בדיני אדם is unrelated”.
I will safely assume that this is a total misquote (or taken completely out of context) as it seems to be in direct contradiction to multiple sources in our mesorah that identify age 13 as the starting point for any responsibility at all and age 20 for דיני שמים.
(See first Rashi in this week's parsha, for example and Shabbos 89b "דַּל עֶשְׂרִין דְּלָא עָנְשַׁתְּ עֲלַיְיהוּ". It's also seemingly an explicit posuk in Bamidbar 14:29 recording the consequences for the generation of the meraglim who wept: בַּמִּדְבָּ֣ר הַ֠זֶּ֠ה יִפְּל֨וּ פִגְרֵיכֶ֜ם וְכׇל־פְּקֻדֵיכֶם֙ לְכׇל־מִסְפַּרְכֶ֔ם מִבֶּ֛ן עֶשְׂרִ֥ים שָׁנָ֖ה וָמָ֑עְלָה אֲשֶׁ֥ר הֲלִֽינֹתֶ֖ם עָלָֽי׃. Did only those above 20 weep?)
Besides, even this misquote contradicts your egregious statement, as we're presumably talking about דיני אדם when considering actions in Gaza.
For those wondering why this position even warrants a response: a large chunk of the 5200+ posts on this thread voice our legitimate outrage at the lack of moral clarity in the aftermath of Oct 7. If we expect the nations of the world to take a stand for morality and against evil, we have a basic responsibility not to allow words like this to be aired unprotested.