Do you understand that "did not establish X" is not the same as "established not X?" And, as has been pointed out to you many times, the principal reason it could not be established was obstruction by the president, which for reasons of infinite wisdom, they couldn't charge him with. So they couldn't "establish" anything by design.
You'd think that, after the most powerful investigative body in the world looked into the issue, under the direction of Republican AG Jess Sessions, Republican DAG Rod Rosenstein, Republican FBI director James Comey (who Trump fired early on, lol), and Republican special counsel Robert Mueller, Trump would have been exonerated if he did nothing wrong. And yet that's not what happened.