Democrats had both houses and the Oval Office in 2021. The Democrats were as "in" as they can reasonably expect to get unless we want to go back to 2011 when the Democrats had all that and a supermajority.
What was stopping him from doing something now? Who forced him to send more arms to Israel?
And how is the Democrats ability to do the right thing inhibited in any way by people complaining about a CEO supporting genocide?
These arguments sound a lot like when my 10 year old tells me that they'll stop watching video games and do their homework as soon as I stop nagging them. That's nonsense. They do their homework when I take the laptop away and tell them they can't have it back until the homework is done.
Join them. Progressives need to run for local office as Dems. Join Dem committees. Canvas for them. Get to know them. Check out "Run For Something" to get involved.
If you want real change it involves leaving the house and talking to people and being present and available.
You can also vote in their primaries for progressives, if you prefer the less impactful "support" route. But then you're just supporting the people who are doing the joining.
You can't really complain if there are no progressive or left Dems to support if you as a progressive/left person aren't joining either.
Couldn't you say the same for the Republicans, or any party for that matter? ie, "Join them and if enough people like you join them they'll change."
Realistically, some new political operator isn't going to get any relevant positions. And nobody with the relevant positions will listen to a new political operator.
That may work in theory but it's basically saying to create a new Demcratic party from within.