First of all, you are conflating Hamas and Hezbollah. Second of all, the stories about beheading of babies and mass rape on October 7, 2023 have been thoroughly debunked. Third: the pager operation caused indiscriminate explosions at places where non-combattant citizens were present. Not very gentlemen-ly (to use your words), and indeed a war crime. Fourth: What they did in Gaza is arguably worse than carpet bombing.
But the hundreds of concert goers who Hamas killed is very true. Remember how they paraded the broken body of that young German woman around like a disgusting hunting trophy?