There is a belief that they can't beat Israel in war. But I don't subscribe to this. Or at least not in the way we think of winning or losing.
If Hamas are still in power come the end of the horrible war, they will celebrate it as a win. And unfortunately, there is nothing to suggest they can't win a conventional war against Israel's military in Gaza or at least cause huge damage, with defensive traps and drone warfare. The dominance of heavy armour and tanks looks to have taken a dint with advances in small drones and loitering munition over the battlefield.
Hamas are unfortunately a well trained militia army with some serious firepower, just like Hezbollah in Lebanon. Hamas are estimated to have 50,000 fighters. Hezbollah 100,000. To put that in context, the UK army has 112,000.
So I know it always seems silly to suggest Israel will never be beaten and it's security is guaranteed but this isn't the case.