The IDF revealed on Friday, what it described as intelligence showing a Hamas command center located under a the Shifa Hospital in Gaza City. In a briefing, Rear Admiral Daniel Hagari told members of the foreign press corps that there are areas in the hospitals that are used by Hamas to direct its military operations.
Palestinians in Gaza have been offered citizenship, relocation for their families, and a financial reward to snitch on Hamas.
Hamas is very popular unfortunately. Still hundreds, maybe thousands now, of collaborators including the family of its leadership.
Oh yea also your numerical comparison is more like 1/50 are Hamas fighters or directly involved. We (as in everyone native to the region) have big families with lots of kids which is why the population demographics look like they do. My grandma was 1 of 12 siblings. The guy I linked is 1 of 9. But as the guy I linked said the kids are taught and expected that being a militant fighter is a noble goal so a few young men in each family end up becoming fighters with family support.