Again, it surprised me to learn this, and I find many others are similarly unaware. And again: the situation is complex and nuanced.
Also, I'd point out that the attack on the King David Hotel was widely condemned by almost all mainstream Jewish and Zionist organizations, including the official Porto-army of Israel which turned into the IDF, and including by Ben Gurion, Israel's first Prime Minister.
Btw, if you want a fact that's sure to wow people - I'm fairly certain that, to date, the KDH bombing was the deadliest terror attack in the Palestinian/Israeli territory. (Excluding October 7th, of course, which I'd personally categorize as an invasion, not as a single terror attack.)
<https://en.wikipedia.org/wiki/1983_Beirut_barracks_bombings>
(As I've said: all sides here.)
NB: Skimming that article right now, the bombing seems to have pre-dated Hezbollah (generally given to have formed in 1985), though Iran's hand in affairs is fairly likely, and "Islamic Jihad" may have been a label adopted by Hezbollah or a nascent precursor group. The event is somewhat coupled to events in Palestine given the PLO's involvement in Beirut.
That said, you were specifically responding to this comment:
> Too bad militants don't really follow those same rules regarding uniforms etc. Trust was lost long ago, before even the first suicide bomber wearing civilian clothes set themselves off in a crowded market.
My point was that this is long enough ago, and before Israel was even founded, so bringing it up as a counter-example of Israeli behavior, which is what you seemed to do, is very fraught. Israel didn't even exist at that time!