I took the final couplet as intentionally naive. The narrator and reader both know that the MRI techs are not really saint-like, just as they both know that the MRI techs are not really extraterrestrials.
I've certainly encountered a lot of surly and/or incompetent healthcare professionals during my family's many medical adventures, but I'm happy to let this narrator have his childlike moment of calm in a stressful situation.
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