I'm not a Trump fan at all but even I see this and question if it was really done by a Trump supporter or if it was by someone trying to tie it to Trump supporters. It just seems very counterintuitive to do something that bad but then put "vote Trump" on it in hopes of somehow swaying voters towards Trump. It almost seems like the person is trying to make the point that by voting for Trump then this sort of thing will happen or in a pretty dumb way trying to make it seem like a Trump supporter did it. Either way it's wrong and the person that did it isn't helping his or her cause at all.