That is simply not true. There is no evidence of Hamas systematically stealing aid from the rest of the population. On the contrary there is plenty of evidence showing Israeli citizens preventing aid from entering Gaza and the Israeli military doing nothing about it.
We have evidence of aid reaching Gaza being distributed orderly by the Gaza police (a Hamas organization) and then the police officers orchestrating the distribution being targeted and killed by an Israeli missile. The optics here is that Israel is trying to prevent aid from reaching Gaza, and what little aid gets in, they try to create chaos such that this aid is not distributed to those in need.
Israel always allowed as much aid as needed. Hamas kept stealing it to create the crisis and have useful idiots say it's genocide.