I normally check my luggage but keep my backpack which can easily be rather full with work laptop and personal laptop + other junk. As such, I put it in the overhead bin and it does annoy me when people think they can just move it or jam other stuff on it and I specifically tell them not to. Where else do you see people thinking they have the right to mess with someone else's belongings? It isn't just the FAs (they do have more right, but they also have more responsibility and more liability in my opinion). Luckily never had anything broken. I would hold the FA/airline responsible for anything they broke.