Does viewing a psychological threat as a combatant make it easier to remain calm?

Why do so many people judge someone's potential as a parent based on how they interact with kids before they have their own?
Where do our forgotten memories go? Do they dissolve into nothingness, or do they quietly shape the architecture of who we become?
What's the craziest reason you've seen an adult friend get upset about, like they were a kid again?
Why do you think some adults throw tantrums over seemingly small things, like not getting the last karaoke slot?