We elect the politicians “we deserve” from a ballot consisting of a selection made by the few thousand richest people in the country - the ones fund the candidates.
I’ll just put this out here: if the RNC and DNC reverted to a closed primary in every State for all candidates, not only would I not shed any tears but I would be cautiously optimistic that this would be an improvement in our overall electoral politics because I am not a fan of the various flavors of populists that are beginning to realize power.
Regardless of how we get our nominees though, the quality of our elections and the integrity of the outcome is unquestionable. You’re free to disagree with the qualities of the processes we use, but the process is written down in advance and followed.
Not to mention how primary results become conveniently bungled (one party in particular comes to mind) when they favor candidates which are not particularly well liked by the establishment. The fact that the national political committees are private corporations doesn't instill much faith in the fairness of their electoral processes.
Regardless of how we get our nominees though, the quality of our elections and the integrity of the outcome is unquestionable. You’re free to disagree with the qualities of the processes we use, but the process is written down in advance and followed.