Really? You really don't see a motive to make a swift arrest of the man who just fired the shot that might set off the class war? After we just watched every billionaire sweat for the first time in their entire lives?

NCPD/FBI is being pressured extremely heavily to produce results, and the people doing the pressuring aren't likely to care if the results are correct just as long as the results are visible - not to mention which, the agencies involved are kind of known for doing stuff like this before. The poors must be reminded that they will be swiftly hunted down and imprisoned or executed if they attempt to follow in the perpetrator's footsteps. This message must be presented quickly and made visible to every citizen, make a big show of it so everyone knows what happens when you mess with them. (Like a 40-strong perp walk and accusations of terrorism in addition to murder, for instance. Hmm.)

Therefore, if they really actually can't find the guy, continual pressure for results is going to become pressure to arrest a patsy instead so we can start the show already. The show must go on. And starting the show requires the star character.

I have no proof of any of this and it could reasonably be called a conspiracy theory, I guess. I expect no one will ever see anything approaching proof of this, for the usual reasons and methods that police misconduct is covered up with. But my common sense tells me that every detail of the arrest report practically screams "obvious plant" all over it, and the motive to do so is quite clear.