UK actually cared about its people. They evacuated them (which the Government of Gaza will not). They sent their kids away (which the Government of Gaza will not). The UK invested in shelters and other infrastructure (which the Government of Gaza does not, except for their soldiers).
You need to compare it to the death tolls of the nations that also did not.
Comparison to UK building shelters during WW2 is not reasonable and mentions of "which the Government of Gaza will not" are disingenuous. They can not in any meaningful way build shelters that would protect 2.3 million people living there.
UK was ~500x the size, not including colonies, or whatnot and a great power not under decades long siege at that time.
On the other hand, Gaza is small, and Israel famously blocks imports of construction materials and technology to Gaza, and attacks international ships and kills crew that attempt to bring it there without approval.
Civilian bomb shelters are also not very useful without a warning system and against an enemy, that can target them directly and is in the sky 24/7. Show me a typical Israeli bomb shelter that can survive a direct hit from one or two of those JDAM guided 1000/2000 pound bombs, without everyone inside being killed. Locations of all the shelters would be known to Israel, so they'd be easily targeted.
Anyway, yeah, apples and oranges of a situation, comparing this to anything in the past, including air raids on London.
Deaths 160 Injured 250
"one of the most destructive air raids of the Blitz during World War II"
Quite comparable to Nazi air raids over Britain.