The problems around bird flu were solved ages ago, it was just good old fashioned collusion among the egg producers to keep prices high.
I'm not quite sure why Joe Biden didn't act. I get that he was old but he wasn't that far gone. I suspect he underestimated how big of an issue it would be and it is remarkably hard to enforce antitrust law in america. Plus Democrats are fucking obsessed with following process and procedure and any enforcement action would probably end up involving the doj and well, biden's biggest mistake was putting a republican in charge of the doj in an effort to be bipartisan...
The point is high prices are a political issue not an economic one