Yes. TSA security theater is all paid for with a specific line item on your ticket. It is not that expensive:

> The fee is currently $5.60 per one-way trip in air transportation that originates at an airport in the U.S., except that the fee imposed per round trip shall not exceed $11.20

The rest is covered by tax payers, not airliners specifically.

https://www.tsa.gov/news/press/testimony/2020/03/03/examinin...

Yes. During COVID multiple airlines either almost went bankrupt or suffered huge losses because most of the cost of flying is depreciation of the airplanes themselves. That's why even though the US govt paid for airline employees' wages and fuel costs were 0 because no one was flying during COVID, airlines still suffered big losses.