Characters wearing Trump costumes followed orders or manipulations from government agencies. Not all of them were aware of the real purposes of what they were doing: to feed anti-Trump images to the media and provide an excuse for indicting real Trump supporters. Making the illusion seem more credible, some of the crowd committed crimes. After months and years of mistreatment, many of the accused, including guilty and innocent, pled guilty. Lawyers representing them probably informed them what the DC juries and judges would be like.
I think Trump supporters did a good job of creating those images without help coukd there have been a leftist instigator or 2? But that mob overall fed on its own power and energy.