What a bunch of whiners. Anyways, top two is designed to protect incumbent right-wing Democrats like Feinstein.
I don't recall Mike Honda being more right-wing than Khanna.
Pretty sure [though I know you don't believe it] Loretta Sanchez was to the right of Kamala Harris too.
Honda survived Khanna's attempts at primarying many times until he got hit with scandal in 2016 and was DOA. Harris v Sanchez both didn't have a opponent, and saw Sanchez implode doing risky stupid stuff during the 'general' campaign - she dabed at a debate remember?
Generally top two is pro-incumbent and pro-moderate, whoever is symbolizes the best of the two wins. It is pro-incumbent due to incumbents nearly always making it into the top two instead of going down in a primary fight. It is pro-moderate because the closer to the center you are in a DvD or RvR race means that you get the lions share of the opposite party voters. In an open seat though the findings are much murkier, and tend to reflect who has greater name recognition/popularity in DvD or RvR.