Why have so many Capitol officers who were present on Jan 6 died?

Unless I'm mistaken, two reportedly killed themselves, and the third died under bizarre circumstances which have all the hallmarks of another suicide or a cover-up.

Why? What happened that day which was so shameful that they turned to suicide?

Think about it. Cops and first responders deal with stress and death often. The Capitol incident, objectively, was far less violent or gruesome than "routine" police incidents such as car crashes, shootings, or domestic violence incidents with dead children.

Wouldn't protecting the nations capitol be a source of pride, not shame?

What do you think is behind this?