Trump questioning whether or not there could be possible safe ways to inject light or anti-bacterial agents is not a dumb question. The dumb would begin in people hearing his question and thinking he is promoting doing so. He is not a scientist nor a doctor, hence the reason he asked if something like this was even a possibility. A safe anti-bacterial agent or light-emitting agent is not out of the realm of possibility as everything was impossible before being invented.
I am sure someone will go drink some bleach and say "Well Trump says it is okay!" just to once again bash him and don't get me wrong Trump can be a total ass at times I am just tired of the media blaming every stupid thing people do on him. Like the person who decided to start drinking fish water...bet they eat Tide pods too.
I'm so sorry, world! If this doesn't prove that our American 'President' is a straight-up idiot, I don't know what does.