The system isn't immutable, it just has protected itself very well from any third party breaking the system as it is. We will get a third party, or more, and end things like first past the post and Citizens United much faster by taking over the Dems than by trying to get a third party to have plurality support. It's simply unrealistic to keep bashing our heads on a wall that is more likely to continue to cement the system against us, instead of changing the system in an achievable way.
AOC, Bernie, and a great number of the young Dems are ready to take over the party. There is broad support to kick out the appeasement supporters and change the party to start making changes. The harder we try to gain third party support right now, the more entrenched the current establishment gets. We've seen this happen for decades. The support for ending the two party system and things like Citizens United is bipartisan, but mostly Democrat voters, meaning Republicans will change more and more rules and make the system more and more unfair. We don't have the generations it will take to bring third party support to where it would need to be. That's generations of Republican power subverting the system. We need to change it now.
You lose all credibility blaming every person in a country, even those too young to have voted in previous elections, even those that have been using every ounce of energy to fight the system for decades, even those that have become victims of the system and live disenfranchised and forgotten. You sound bitter and hateful, when there are millions of people in the US that feel the same way. How can you be so blind as to assume all of any group is complicit? I understand the frustration, but you're misdirecting it wildly. I'm not stupid, I saw this coming, I've been fighting it as long as I've been alive, as has my community around me. "Fix your country?" We're trying. I don't control the media, I don't control the propaganda machine, and I can't educate the millions of Americans that are caught up in it. All I can do, and have been doing, is protest, vote, raise awareness, and live in active, visible defiance of the system.