This is an incredibly important question to understand if you're American or are ever in the jurisdiction of America. America is not the land of the free or equality or civil rights. Almost everybody commits a handful of crimes every day. Sometimes bigger crimes. Sometimes felony huge crimes. I'm talking ordinary people like your grandma. You know like your grandma, not actual "criminals".
For example when Grandma drives 45mph on the highway, that's a misdemeanor in many places for going too slowly. Then when she fills up her big gulp and takes a few sips then tops it off, that's criminal theft. When she sees a letter addressed to you delivered to her and opens it so she can tell you what it is, that's a felony criminal offense with a 6 month federal prison sentence attached.
Now the police are just snitches. If they see you do something they can ticket and/or arrest you. If you're not doing something wrong, but don't agree to be arrested, congratulations now you've actually committed another crime!
But the end of all of this is the district attorney, the DA. The DA (the office with lots of staff and a main big head honcho) is tasked with looking at these charges, deeming what is really a crime they care about, and bringing forth charges. Of the DA got a report on your grandma committing a felony mail fraud by opening your mail, you'd hope in a sane world they'd laugh it off and ignore it. The problem is this relies on one person or a small group of people making the "right" decision which ironically is illegal itself, and choosing what charges to bring against who.
When things are high profile, they bring all charges because they have to. Not bringing charges is against the law itself, but again is handwaved higher up because that's the stupid system. Then it's up to the actual judicial system to decide the criminality and the punishment, then enforce. The import take away at this point is that in the USA, you can literally be charged and arrested at anytime for anything. That is not hyperbole. If you want an example on the other side of the spectrum, look at the lawyers talking about Trumps crap. Everyone knows he's guilty but getting a jury conviction, somewhat unlikely considering you need 12/12 in agreement. So the pundits correctly say, if we know he's guilty they can charge him with these other random crimes and get him. If he's in jail, who cares what for. This is done ALL THE TIME. Most famous high profile case being Al Capone. Everyone knows he was a mobster and killed people. But they couldn't make it stick. So what do they do? Charge him with tax evasion crimes and give him the maximum penalties for everything. If they want to get you, they can get you.
So back to Hunter. Nothing has changed as the alleged crimes. Everyone is in agreement he did it. His crimes are nothingburgers. Lying on the gun app is something most rednecks do all the time, it's a formality paper. And funny enough, they're happy with him losing his gun rights for drug use, the second amendment doesn't apply to him I guess. That lie on the application is the first crime. He's guilty. It is usually a slap on the wrist, no time, no fine. But it CAN be prison time. So for him, it is.
The other things are tax issues. He misreported and misfiled taxes for many years. Daddy paid the back taxes, he paid Daddy back. In most cases the IRS is happy with that, sometimes they assess a big fine. Everyone goes on their way. But the IRS charges can impose federal prison. And for him it is.
I understand it's a large wall of text. I understand it goes against most of what Americans believe. And most will never experience it. But it is there. And you need to know it.