The reason is actually rather easy, and simpler to show than normally describe, why more rapid, more readily, and those with PTSD tend to get angry quicker than others at little dumb things.
I'd like to clarify this, and you will better understand the difference to those with PTSD, and those without.
No issues with that one.
The evident, when something bad happens, or is actually hindering you, is generally classified as "bad stress", which consists such matters as paying invoices, cash, relationships, getting fired from your own job, etc etc etc. Everybody gets bad stress at some stage of their day; it only depends on the person themself, and the sum.
As it is possible to view, an individual that is normal is represented by Cup 2, and with both negative and positive stress. They still have lots of room inside their cup without overflowing (exploding, rage, wrath, etc etc). Before being shoved the PTSD cup over the edge, a regular man has the ability to take a great deal of anxiety in their everyday life.
Now whilst we still have both nice and bad anxiety, there's now this thing called "PTSD" in our cup. The issue with that is that we have the same number of good and bad stress as everyone else, though we also have this big hunk of PTSD which features more and the PTSD cup our traumas.
As you can see from this cup, with great pressure and PTSD, you truly do not have much room for anything else. A little "bad stress" for a person with PTSD, and they overflow rather fast compared to anyone else.