"Like tax evasion or whatever..."

The whatever part that you're dismissing is: - Manafort guilty of Conspiracy to defraud the United States and witness tampering. - Cohen guilty of lying, perjury, and campaign finance violations directly intended to influence the election - Gates guilty of making false statements and Conspiracy against the United States. - Flynn and Papadopolous guilty for lying to the FBI - Stone on trial for lying and witness tampering.

The bank fraud and tax evasion charges are just the means by which they were caught doing all this other illicit activity.

Your argument is like saying: "So what if they're guilty of executing financial transactions like an organized crime ring would? That doesn't make them an organized crime ring, you didn't it prove it in 100% of your charges against them, so none of the parts that you did prove should count either".