They can certainly kill. The only reason they don't is Iron Dome is well capable of intercepting most rockets that are heading for populated areas. Also, people in shelters and safe rooms are also likely to be fine even when those things do hit. It's taking measurements that's saved lives.
Obviously the world wouldn't give a rats ass about that - but one thing the rockets do regardless is disrupt lives. Heavily. Just think, living for years and years with sirens on a regular basis and those things falling down. But hey, those people rarely die so it's not big deal...
Hamas could quite easily save lives in Gaza. Don't fire at Israel, we won't strike back. It's quite simply. But hey, they are freedom fighters, so it's OK that they fire - we must have started it - and it's OK they don't give a damn about their people because they know what's coming...