Hamas probably calculates that more deaths will prompt Western governments to pressure Israel to grant Hamas's demands.

Well yes, calculations may take place (I'd avoid "probably" actually). But on both sides. How would you like it if I claimed that Israel's calculation is that they can kill and kill and kill until the west threatens sanctions? Now I don't happen to think that myself, but it's no less plausible than your contention that Hamas wants more and more of its own people killed. Hamas is answerable to its own people and the wider middle east, just as Israel is answerable to its own people. You seem to be of the Netanyahu persuasion that persistent demonising somehow helps the cause. It doesn't, and, worse, it's very likely to be predicated on lies.