Fear of confrontation... There's a lot of you who deal with it on a daily basis.
Which leads to... you guessed it... procrastination.
The impact of procrastination is always worse then the negative aspects of making the call. For the most part, the person on the other end of the line was raised by similar parents, is human, and you guessed it - fearful (at least to a point) of confrontation as well. It's hard for them to totally blow you up, even if they want to and have the ammo to do it.
Advantage: You. But only if you make the call.
Do yourself a favor today. Make the call that you've been avoiding all week. Tell somebody no. Tell somebody they didn't get the job. Be real and offer up some reasons why that are direct, but talk to them like a friend would.
What you'll find: Nobody dies.
Make the call today. Then make one similar call you don't want to make every day next week.
It's P90X for conflict avoidance.
Make the call.