Why are you quoting Barr's summary and not the report itself?

“Although the investigation established that the Russian government perceived it would benefit from a Trump presidency and worked to secure that outcome, and that the Campaign expected it would benefit electorally from information stolen and released through Russian efforts, the investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities.”

That is the full quote from Mueller, which is not nearly so black and white.

You also conveniently glossed over the fact that Mueller put forward ten examples of obstruction of justice, but did not suggest the President be indicted because he didn't believe it was his place. Or the fact that a full 14 further investigations into Trump and people connected to him have been launched as a result of information found by Mueller.

The report states that they didn't find anything that definitively implicates Trump or his campaign in conspiracy or coordination with Russia, but it doesn't fully exonerate him of other implications, nor does give non-supporters any reason to think they're unjustified in their mistrust of him.