True, that
can happen. That's not really what
is happening in the Mueller investigation, though. So far, almost all the guilty pleas have been due to attempt to cover up connections between Trump campaign staffers and various Russian entities and activities. They have
all had to do with Russia.
- "George Papadopolous ...pleads guilty to lying about his contacts with Russians who claimed to have “thousands of emails” on Clinton."
- "Michael T. Flynn ...pleads guilty to lying about his contacts with the Russian ambassador during the presidential transition. Flynn and the ambassador discussed sanctions imposed by the Obama administration in retaliation for Russia’s election interference."
- "Alex van der Zwaan ...pleads guilty to lying to federal agents about his work with Manafort and Gates on a controversial report used to defend the former pro-Russian government of Ukraine against accusations that it had improperly prosecuted a political opponent."
- "Gates pleads guilty to charges of conspiracy and lying to federal agents, and he agrees to cooperate with the special counsel’s office."
- "Richard Pinedo pleads guilty to identity theft for selling information to Russians."
(
source)
You'll note that none of them are related to, for example, tax fraud in Wyoming or embezzling money from a US telecom.
They all have to do with the numerous ways in which the Russians were involved with the Trump campaign, either through direct campaign contact or arranging the means to target or propagate propaganda.