I mean he needs that to leave. Yes there’s probably other people with key cards but with his personality he’ll probably focus on making sure other people are okay and end up left behind anyway. In the raws, the major doors are still locked so if you get left behind or trapped without a key card you’re fucked (why does this place still have power after an earthquake? Who knows). Was it dumb to not hurry up and leave? Yes. But it was understandable and would be useful if one exit got blocked off while he was leaving since the collapse happened so fast. It’s very unrealistic that everyone got out with such a short timeframe between the warning and the collapse
The building's about to collapse and your main concern is your key card? Sure, doc.