> For what it's worth, the decline of trust in institutions is primarily among "Republican/lean Republican" respondents, who are a minority of American voters and likely a minority of American non-voters as well.

The problem with this line of thinking is that "Republican/lean Republican" is not a fixed trait. People can switch to that category instantly, overnight; so dismissing them just because the last time there was an election the other party managed to curry more votes after having every advantage possible - that's quite dangerous from a societal coherence standpoint.