...because this is what happens when you invite an uncontrollably large crowd, with varying levels of training, and give them only vague instructions.

He must have known, so I'm pretty sure he got exactly what he wanted. Now, why? What is the strategy behind assembling a crowd of a few million and letting things take their course?

I'm confident that President Trump has a plan; he straight up wrote The Art of War Volume 2. We would be wise to try and understand that plan.