Specifically, the "dirt" on HRC was described as evidence of illegal Russian campaign contributions to her campaign. Had actual  evidence surfaced at the meeting it would somehow be illegal to see it? THEN DJT Jr. should be in jail for seeing it? What were the chances this "real" evidence would see the light of day had it been in the FBI's hands alone?  
Had Jr alluded to asking help manufacturing dirt on Mrs Clinton, or asked that this dirt  be desseminated through back channels sight unseen I would agree with the description of collusion.