Comment by trimethylpurine

There are some problems and differences that you're ignoring.

The goal of previous terror groups wasn't extermination. In fact their goals were largely in alignment with Western morality. Targets included key infrastructure, not specifically civilians. This is similar to Western military efforts.

The US hasn't needed to do much propaganda, Hamas has made themselves intolerable in Western society by beheading children, recording it, and disseminating it, among other similar media interaction. Their goal is to alienate Islam in order to preserve it in the face of westernization. They don't want Palestinians to be accepted in Western society.

Given the historical dissimilarity, why would any Western government believe that Hamas would suddenly gain Western idealism within the confines of a Western democracy?

I don't see any reason that we should, especially when relying on the historical accounts you've provided.