Plenty of states have had widespread protests and violence without any civilian deaths caused directly by the military or police, because as has been stated the first solution shouldn't be to just kill or seriously injure the people protesting. And there have been plenty of cases contrarily where modern democratic states have conducted themselves horrendously - often they've been condemned for it, but that shouldn't make what Israel are doing okay.
Again, the more pertinent problem is that I'm not really sure what Israel are hoping to achieve out of any of this in the long-term. These incidents will only further drive Palestinians seeing their families and friends killed to greater extremes. Hamas are awful, but they're exactly what happens when people are oppressed and seek desperate measures when it comes to fighting back.