There are two aspects to the Left's cry of "Russian collusion!" The first involves explaining how Hillary Clinton lost. The second has to do with destroying President Trump (by which I mean destroying his presidency). The recent charges by Special Counsel Robert Mueller against 13 Russians may have something to do with the first of these, but they have nothing to do with the second.
Let me explain. To the Left, Hillary Clinton should have been elected president in 2016. That she wasn't requires explanation. Part of the explanation may be that Russians (or Russian agents) used propaganda or other forms of disinformation to influence American votes. Mueller's charges constitute evidence (though not sufficient evidence) of this. Russians were doing what Russians do.
Mueller's charges have no bearing on the second matter, for they show no collusion between Donald Trump or his campaign team and any Russians. Perhaps other indictments will come, but so far, there is no evidence of collusion.
In its zeal to "get" President Trump, the Left makes a classic mistake. It conflates explaining why Hillary lost with establishing that Trump colluded. The reasoning seems to be that because Trump benefited from Russian involvement, he instigated it; and if he instigated it, then he "colluded" with the Russians to throw the election; and if he colluded, then he should be impeached and perhaps prosecuted.
The Left has nothing except raw hatred, and the strength of this emotion causes them to make simple mistakes, both of fact and of logic. It's actually quite fun to watch. It's a prime example of how emotions (especially powerful ones) cloud judgment.