General Discussion

Everyone left after the insurrection. They had to be identified and charged before they could be arrested, since they were not caught in the act.

And they were. Most were identified from videos and photos by people who actually knew them. There was an easy way to report something like that, and such reports were followed up.

You try to make it all sound very simple, but it never was simple at all.

And then there were the main perpetrators. Before they could be charged, evidence had to be collected and plans made for charging and prosecution. That takes longer. And, in the case of a POTUS, much longer.

You're not an expert on such things. Neither am I. However I know how complicated they can be and how much time is needed to do the job. And, it was done. Not to your satisfaction, of course. Frankly, I doubt you could ever be satisfied - assuming you are actually speaking your mind and not doing some sort of obfuscation.