Hardly anyone has actually read the full 400 page report. And "collusion" has a specific legal meaning which can easily be skirted by a whole raft of plausible deniability methods - Mueller is a stickler; he's almost certainly not going to say "collusion" happened unless he has definitive proof that would hold up in court.
Not true at all.
No one except the DoJ and probably white house have seen the Mueller report. They do all they can to prevent people from seeing this supposedly exonerating report.
- leak more documents(Trump tax returns)
- get more publicity(asking Trump Jr to retweet/push their stories and lead viewers to their site)
- fight allegations of partisanship(publish anti-Trump documents)
How else would you approach Donald Trump Jr in this conversation? You need to give him some reason to help you.