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)
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.
Because all their friends stay. So to get them to switch, you'd need everyone thay know to switch, which would need everyone they know to switch...
... soon, you need to organize a switch between millions of people, which really isn't happening.
So the only people on fedi are those ok with keeping multiple profiles, and even then just the ones that value the technical aspects over quantity of content: mostly tech nerds and people with strong feelings about politics.
Cartels have boats, but no one's shipping drugs up to Canada just to smuggle them south: They just get shipped directly to the US
Trump is just making up an excuse to justify cutting off trade with Canada.
Really, the whole fentanyl thing seems like scaremongering: People do overdose on it, but you won't die from touching it or inhaling trace quantity. It's not even the most potent opioid known, not even close to it.
Other side:
Schematic:
In the moment, yes.
However, the longevity of digital data is problematic. Computers have existed for less then a 100 years, but you'd already be hard pressed to read the data off a deck of punch cards or reel of magnetic tape.
Modern protocols and formats are much more complex, so I'd say that reading your data in 100 years will be harder then reading 100 year old data today. Have a look at a pdf in a text editor. Imagine trying to figure that out once the documentation is lost. (... or stored in the pdf)
Without continual efforts to convert data or preserve hardware and software, the data will be lost.
Compare that to written documents. We have writing that's thousands of years old, and it's still legible and understandable. We have paper documents about as old as we've been able to make the stuff.