Forgiveness

Why is it easier to forgive someone else than yourself? 

Last night I accidentally spilled some liquid on myself, the couch, and most importantly our old computer.  This computer is on the last legs of it's life and has been for some time now.  If someone else had done this to my computer I wouldn't have been to frustrated.  After all I have apparently had my phone dropped in a tub of water (yet it works), a nice pilsner glass broken, my car rear ended, a bracelet torn off my hand, a favorite book that was part of a boxed set lost, and I'm sure if I keep racking my brain I can come up with some others.  In the moment these were all a big deal and I wasn't happy to lose (or suffer damage) these items.  However, I was quick to realize that they were material things and their loss or damage was not catastrophic.  So I never held any grudge against the responsible parties and it was water under the bridge after a short while.  However, with the computer I was the one at fault and I really held it over my head.  I was frustrated and dwelling on it for the rest of the evening.  The computer was the HyWy's and she even told me that I shouldn't sweat it.  But then it all made sense when I realized that it is so much easier to forgive others, but it's hard to forgive yourself.  I don't know why.