Your analogy of the UK besieging the Republic of Ireland is absurd and ultimately shows your own ignorance on the situation at the time!
The ROI was opposed to PIRA throughout the Troubles so much so they brought stricter, harsher security laws in against them. These were tougher than the equivalent UK laws. ROI also censored PSF/PIRA in broadcasts BEFORE the UK did.
Irish navy helped disrupt PIRA arms smuggling in their territorial waters too as did the Americans.
What you're is missing is that PIRA and UVF didn't control vast swathes of Northern Ireland.
Hamas controls Gaza.
Because of that reality most Catholics and Protestants didn't support these terrorist groups.
On the other hand, because Hamas controls Gaza most Palestinians support them as polls show.
Immediately, your comparison with Northern Ireland is defeated.
So, the ridiculous comparisons with the UK bombing or besieging the island of Ireland simply doesn't stand.
On top of that, it shows those who make these kind of comparisons ultimately don't understand the reality of the situation in Israel-Palestine too!
Spelling out the reality of it is not the same thing as supporting ethnic cleansing and genocide either.
People are supporting the action to defeat Hamas who use civilians as human shields. Do nothing and Hamas will grow stronger with better weaponry.
In fact, when Israel withdrew from Gaza in 2005...this from Reuters:
"For Iran, Hamas has helped it realise a years-long ambition to encircle Israel with legions of paramilitaries, including other Palestinian factions and Lebanon's Hezbollah, according to Western officials. Armed with sophisticated weaponry, all share a longtime enmity to Israel's occupation of Palestinian land."
And:
"After Israel withdrew from Gaza in 2005, Hamas began importing rockets, explosives and other equipment from Iran, Western intelligence sources have said. They were shipped via Sudan, trucked across Egypt and smuggled into Gaza through a labyrinth of narrow tunnels beneath the Sinai Peninsula, they added."
https://www.reuters.com/world/middle-east/how-hamas-secretly-built-mini-army-fight-israel-2023-10-13/
Hamas rockets used to be pretty crap. In 2023, they can travel 230km or so and more accurately than in the past.
That's the reality.