They did not rig the primaries. Democrat voters got who they wanted even if it was a questionable decision. If they went through all the trouble of setting it up then why wouldn't they use it? Trump Jr did something wrong. The court of public opinion is different from the court of law. Voters are already negative on Trump's relationship with Russia. The fact is that it does prove collusion or the willingness to collude. If you agree to a meeting to receive stolen goods, you are guilty even if you never get the stolen goods.