Gaza is tiny (about the size of Birmingham) and was one of the most densely populated countries on earth. Because its tiny, the population impacted will of course be smaller.
People have huge concern for gaza for many reasons, partly because of the history and the west's responsibility for creating Israel. But partly because it's an occupied territory. There is also no way in and out of Gaza. People can't leave (escape) as Israel has walled them in.
Gaza has an unusual population in that the majority of citizens are children.
When Gaza is bombed, it's like dropping a bomb on one of the most densely populated parts of birmingham. However, there is nowhere for people to go because they r trapped there. Imagine Birmingham had a heavily armed wall around it. It's an occupied territory so residents rely on Israel to tell them.which parts of Gaza are safe to go to. But Israel is their attacker. So when told 'flee north', Israel bombs the north. Palestinians in Gaza don't know where to go, what to do.
Gaza is like living in a densely populated box that you cannot escape from. A box which, due to Israel's murderous campaign, now has no decent sewage or mains water functioning, no safe, working hospitals (mainly rubble now), no schools (rubble now),.ho homes that can be lived in (rubble now). The entire population of this tiny box has witnessed immense trauma. A WHOLE population is traumatised but most of the doctors and psychologists/psychiatrists have been murdered. The entire population has at least two or three close family members who have been killed, maimed, blown to bits by the IDF. Because the majority of the population are children, many children there have been orphaned and roam the rubble trying to find scraps of food for themselves and their siblings.
We wouldn't treat animals this way.
People are concerned and horrified about Gaza for all the above reasons. In addition, israel assassinated journalists who lived in Gaza, and no foreign journalists have been allowed in, so we know they tried to hide their murderous campaign. So death numbers are likely to be an underestimation.
Nowhere really is similar to Gaza. Of course, there are terrible atrocities happening everywhere in the world, but Gaza is both unique in the ways described, and everything happening there has been perpetrated by "an ally" and a so-called "democracy", with arms funded by UK, USA etc.. so the west is responsible and in a uniquely complex position.
It's not that people don't care about atrocities elsewhere, it's just they are horrified by this incredibly unique genocide.