Well, aside from what others are saying...
Try to picture Trump on the phone with the Proud Boys, giving them explicit instructions or discussing strategy. Even if he did talk to them (which I doubt), surely it'd be his usual "We're going to do great things, great things, we're all great people, we're gonna turn this thing around, it's going to be beautiful!"
When Russia collaborated to help Trump get elected, do you figure they talked on the phone in person? Or emailed back and forth? Motherfucker couldn't make it through a one-page intelligence briefing, I'm not even sure he can write. Surely it was Trump's people working with Putin's people (several levels down in both cases).
You need to prove that Trump personally and intentionally violated the law. It's not enough to show that shady shit was going on around him. And that's hard to prove, since he generally was working at a remove. And this is a guy who's been in and out of courtrooms his entire adult life; surely he has some instinct for what kinds of things to avoid.