I've been reading your comments about all the ways agents make you crazy about not returning your queries, or letting your manuscripts sit for too long, or general crapola that annoys the snot out of you.
Let's all pause to reflect on the numbers.
You: send 100 query letters in the course of your submission process at the most. Most of you send fewer than 20.
Me: I get 100 letters a WEEK. 52 weeks a year.
You: If you get two or even 15 out of twenty screw ups you're convinced the world is going to hell in a handbasket and agents are the reason why.
Me: 15 screw ups out of 5200 is still a pretty good batting average. If I only mess up one a week, that's 52, and I know the average is probably at least 5. That's 250 mistakes, and that's just me.
Try to remember the volume of stuff that physically comes through the door, and that's not even counting any of the electronic stuff.