Did Trump do the right thing pardoning all the "January 6th" protesters?

Absolutely yes.

And that's because pretty much all of them were political prisoners convicted in corrupted kangaroo courts, for political reasons rather than actual crimes.

There are literally hundreds of examples of absolute travesty in this regard, but one example is particularly egregious: An older woman, a grandmother, happened to be in front of the Capitol Building during the riot (which was significantly milder of a "riot" that most far-leftist protests). She didn't really know what was happening, but she saw that a lot of people were entering the building through its open doors. She also entered the building alongside all the other people, just to see what happened inside. Since nothing much was happening, she left the building after a minute or so, and went on her way.

She didn't break anything, she didn't assault anybody, she didn't threaten anybody, she didn't even say anything to anybody. She literally did absolutely nothing, other than just entering through the open front doors, staying inside for a minute just looking around, and then leaving.

She literally committed no crime whatsoever. She didn't even commit a crime of trespassing (because that requires for her to be informed that she's trespassed, and for her to refuse to leave after the warning.) She was literally 100% innocent of any crime, no matter how minor. She didn't even know that there was something possibly illegal going on, because she just saw a crowd of people slowly entering the building through its open front doors, and she just decided to check it for a minute before leaving.

But because she was tried in an absolutely corrupted kangaroo court, she became a political prisoner for merely being inside the building for a minute, and was convicted to something like ten years in federal prison.

This is the literal definition of a political prisoner: Throwing someone in jail because of her (alleged) political views, even though she hasn't committed any crime, in a very Stalinistic "show me the (wo)man and I'll show you the crime" fashion. Textbook example.

And the vast, vast majority of the people convicted for that event were not much different.

So yes, Trump did the absolute right thing to reverse that complete travesty. A free democratic country absolutely must not have political prisoners. That is against basic human rights.