It actually precludes them from further litigation under the statue of limitations.
Legal and personal consequences aren't the same thing.
It seems to be an alarmingly common tactic of faux-reasonable people
Whoa whoa whoa. faux-reasonable?
Absolutely. Those that want the appearance of reasonability by appealing to high-profile topics, but lack any actual solid basis. It's the same kind of thinking that sees REers use their 'do you think you know better than Einstein?' (keeping on-brand with the forum). Appeal to something people respect and associate yourself with something perceived as reasonable, rather than be reasonable yourself.
Court-case legality and personal morality are very different beasts. Take fruit of the poisoned tree; you can have solid evidence someone is a serial murder-rapist, but if that evidence was obtained in a questionable fashion, it's inadmissible. If legality was all we were concerned with, you could know for a fact someone was a monster, but be expected to forgive them and act as though they weren't. Courtroom legality like this exists to try and ensure investigations are carried out in a way that doesn't give unjustified power to every Tom, Dick and Plod, not to tell a private citizen how to live their life. If you know something that's inadmissible in court, you should still adhere to it when you live your life.
Do you even know how legality works? The degree of proof required varies even depending on the crime they're accused of. You can be liable in civil court but not guilty in criminal court, how then should one consider a situation like that?
If you find yourself needing to appeal to high-brow 'statute of limitations,' 'innocent until proven guilty,' 'free speech,' as opposed to just talking about the matter at hand, it's a pretty clear indication your goal is in appearing reasonable as opposed to actually being reasonable. Yes, those things exist, those things are true, but no one lives their life as though every decision is a trial. Bringing in fundamental laws of the land to talk about personal points of view, as opposed to criminal action, is like invoking a tsunami to water your houseplant. Someone might get the idea your goal is something other than the houseplant.