Its clear you are being an idealist. It just seems rather unrealistic. You may not like the idea of "voter accountability" narrative but it is the bloody answer. Nearly 30% of eligible voters didn't even bloody vote and I'm talking about the 2020 election. Which is the election with one of the highest turnouts in recent memory. Also we as voters should be participating in the primaries/caucuses, it is a part of our civic duty. We can desire accountability from our candidates but we voters also need to be accountable for our (as a whole) inaction, primaries have an attendance of around 30-20% for both parties combined. This calculation is also only based on votes during primary divided by eligible voters in that state. None of the values I have found divide the number of votes by the amount of registered party members and I feel that number will be a bit more enlightening even though it will be flawed unless it was a closed primary because Democrats are thought to have the higher population appeal but my own assumptions would tell me they are also the ones who are the least likely to attend these events even though these events are the ones who decide who will be the running on the ballot in the general election.
Sure you may want to be this idealist but face the fact that authorities aren't the only ones who need to be held accountable.