You are right and usually I don’t harbor these types of feelings for a long periods of time. But to me it was a VERY big deal and it took her 5 minutes to get rid of over a years worth of hard for me.
Imagine going through background checks, meetings, and interviews for 12 months. The entire time the size of the initial pool is shrinking as they rid people they believe will not be able to work for the company. We started out with a 65 member pool and by the end of the 12 months we were down to 16, me included. It was very stressful, and a lot of work. After all that hard work she fires me for what reasons I determine to be absurd.
So to me it makes a difference to write that letter.