Wait, you were serious with your comment? My apologies, I thought you were being sarcastic.
DOOM 2016 was decidedly anti-corporate, anti-conservative game that had a general message of "corporations suck," "corporate worship is bad," "religion/occult leads to chaos and mayhem," etc.
Here, in DOOM Eternal, if you view the corporations--and thus, the demons--as "the right" in this situation (and I don't know how or why you wouldn't), then the mortally-challenged line could be explained as the "right" trying to normalize what's bad (demons)--think "very good people"--so the people of earth can hand wave the demon invasion. If you look at how the Trump admin has played out so far, we've seen countless examples of this ugly shell game.
"Don't worry about them, they're fine, they're very good people, they just have some challenges."
Could id have used a different phrase? Sure. But I highly, highly doubt they've pivoted from their "fuck demons/corporations" and "fuck Nazis" stance to wanting the alt-right to prop their game up as some mass triggering event for "SJWs."
Just my take.