This doesn’t require faster than light signaling. If you and the copy are sent way with identical letters, that you open after crossing each other’s event horizons. You learn want was packed with your clone when you open your letter. Which lets you predict what your clone will find.
Nothing here would require the event of your clone seeing the letter to affect you. You are affected by the initial set up. If the clone counterfactually saw something else, this wouldn’t affect you according to SIA. It would require some assumptions about the setup to be wrong for that to happen to your clone though.
Another example would be if you learn a star that has crossed your cosmic event horizon was 100 solar masses, it’s fair to infer that it will become a black hole and not a white dwarf.
This isn’t the flu. America has had 318,000 deaths so far. That’s ~8.5 years worth of flu deaths. One of those years was from the last 26 days. If the world had America’s almost 1 death per 1,000 people mortality rate, that would be about 7.8 million deaths. There are 1.7 million deaths globally. That’s 6 million people spared! And frankly America is in at least a half banked lockdown.
If your country has almost no cases, that isn’t something to complain about. Mass graves would mean that your country had failed to the point that they were having difficulty manages all of the corpses. This point will vary country to country, but it is a lot harder for a first world country to hit that point than you seem to think.