I just tried HardDrive/Library/ColorSync/Profiles/Displays to delete a display profile that I couldn't previously and it worked. I think the problem was that when I created the profile, I clicked the box that said "Allow other users to use this calibration." Clicking that box seems to lock the profile; the only way to delete it is to use the path above. So, if you don't need to reproduce the display profile for another user of your computer, make sure that this box is not checked. Thank you, ashslaveDT.