The Republicans are concerned that the CEO of Delta will apply his political hostility* against people who take off their masks in flight and get them on that list, lumping them in with actual violent people.
As we have seen, leftists apply punishment to people unevenly - depending on whether they are perceived as “one of them,” or the enemy conservatives. (As an example, look at that outrage about a teen who broke curfew compared to the BLM animals who were burning the place down. Or more recently, how parents who dissent at School Board meetings have the FBI sicced on them while BLM rioters are bailed out of jail. And look at how Canada treats peaceful protestors - by freezing their bank accounts to starve them into submission.)
The CEO of Delta wants to be able to make a show of those who take their masks off - and ban them for life - by getting the federal government to reign down on them.
*The CEO is an outspoken Leftist.