Captain Craig wrote:

^^^
Because the actors contract calls for "x" amount of face time. I'm guessing. Otherwise why would this happen so often.
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They do it because they want to show the actor's face as much as possible. That's well-established (Mark Steven Johnson even talked about how, when making
Daredevil, executives told him they didn't think he should be wearing a mask, because it made no sense to hire Ben Affleck and then hide his face).
sonak wrote:

I don't know that it was necessary for him to take off his mask to save the kid. Why not just persuade him verbally that he's just a regular guy, or tell a joke, or try something other than just taking his mask off?
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It was presented as necessary in-universe. Maybe something else might have worked, but it was a tense situation on a pretty tight clock (the "persuasion" one, in particular, would have taken longer in all likelihood).