[mkipper]

The basic argument is that domestic production of integrated circuits isn't economical for American businesses. Having a more flexible supply chain is beneficial to these companies (e.g. when a global pandemic hits), but the required investment outweighs these benefits.

On the other hand, the government potentially has a lot to lose if domestic companies are completely unable to produce hardware needed for critical infrastructure. The government also benefits from these companies expanding their supply chain to include domestic production, so the companies are asking the government to provide enough capital/tax breaks to make domestic production viable, and they're trying to convince the government that this provides enough value to the USA for it to be worth it.

But this is being pushed by lobbyists paid for by giant corporations, so it's fair to be skeptical. In reality, the $50B number probably sits somewhere between "the bare minimum needed to make this viable" and "a handout pocketed by greedy corporations".