I have a friend who has two children who are now allegedly young adults. They smash about 1 phone each per six months and one laptop screen each per three years. Their iPads are somehow intact, but dented to fuck. I, myself, broke a laptop screen when I was 16 (1999) by kneeling on it while it was open and concealed under my bedclothes. In the intervening 24 years, I have broken zero (0) laptop, desktop, PDA, or phone screens except by activities that I knew might result in their destruction (i.e. disassembly without proper tools under an understanding of 'either I manage to fix this right now or I order a new one and it arrives tomorrow’).

All this to say: kids are just rough on shit. They're inexperienced with potential failure modes and thus fail to anticipate what precautions might need to be taken in trying to avoid them. But they mostly grow up (after killing a few pieces of hardware).