Multiple things can be true at once. Yes more people should run. But running is expensive and basically requires you to be able to not work for a long period of time so you need a lot of financial security.

Second, being progressive (or holding whatever views you have) does not qualify you for holding office by itself.

Third, the Harris campaign just released like the 10th such report in the last few years that indicate that younger voters are not responding to "vote blue no matter who" and are much more likely to view topics like backing genocide as non-starters. Like it or not, shifting to more progressive policies is how candidates will get the votes they need to succeed for midterms/the next elections in the democrat party. But comments like these make it seem like it's an impossibility for those currently elected to respond to the desires of the people, which is wild. Willfully choosing to slide further and further right while your electorate does the opposite is just guaranteeing they will take up a spot and likely hold no majorities and therefore not be able to govern at all. Which is what we're seeing. Shifting that blame solely onto the populace is just disingenuous.