While I fully and completely understand the OP's issue -- and I would, like others, always try and keep my eyes on where my bag is in the overhead -- there is NO WAY I would engage in any kind of violent act over the issue. I might just insist in getting off the plane (which will grab the attention of everyone, since they have to make sure you haven't left anything behind, etc, in the guise of...well...kaboomness).

But getting into an altercation or physically injuring someone over something that, in perspective, isn't that big a deal seems foolish. Not only do you stand a good chance of being arrested, spending thousands of dollars on legal representation, and potentially a number of weekends picking up trash alongside the freeway...if the wrong people are around, you might not find flying on commercial aircraft a travel option anymore.

Steve