There are actually dozens of arrests and plenty of evidence, self incriminating evidence floating around the social media. It remains to be seen what the outcome of these arrests will be. If they're arrested and let go it would be indeed weird and inviting for more of this in the future.
Luckily the difference in response is absolutely not emblematic of any serious structural issues in American policing, and we can all move on from this with no real reforms.
That storming the capital doesn’t result in a similar slew of arrests is weird to me