This is very ironic, but not at all funny. While the irony may be satisfying, it isn't going to improve things appreciably and reveling in it is not a healthy thing to do.
If you laugh at someone getting shot because they supported gun violence, then you have just lowered yourself to their level and now everyone is just back to tribal violence.
This isn't even potentially as beneficial as the killing of someone like Brian Thompson, because you can at least make the argument that it might make CEOs think twice before systematically exploiting people for profit. As ironic as it may be, this is not going to move the needle in a positive direction or change anyone's mind for the better.