Definition Convention on the Prevention and Punishment of the Crime of Genocide
Article II
In the present Convention, genocide means any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such:
in whole or in part. Not that you care, just for anybody wondering what the Geneva convention says. Though people should not base their morality on law, even UN law.
The genocide of Palestinians by Israel has been going on way longer than Hamas has existed.
I am no armchair legal scholar, I 've already argued against placing too much value on legality. It is you on the other hand who tries to minimize the severity of Israel's wrongdoings by arguing pseudo-legalistic semantics.
If the 1948 convention never existed, Israel's actions would be just as reprehensible.