

Block user/community/instance.
Report if advocating for violence.
There’s really isn’t enough time to argue with everyone, and these people are probably used to being argued with, and might even take it as evidence of some big conspiracy. – If you want to make changes in the word, there are more productive ways then arguing on obscure forums.
Unfortunately, physics comes in and ruins your plan: https://en.wikipedia.org/wiki/Etendue
Your focal point will never be brighter then the firefly itself: https://what-if.xkcd.com/145/ (at least for diffuse light something sources that emit in all directions)