We do not always have the high ground in an argument.
I am including myself in this statement.
If you refuse to look critically at your stance because you feel so certain you're right, then the likelihood that you are very, very wrong is only going to increase.
If you expect someone who is physically disabled to try harder than their best, that likelihood has reached 100%.
This is a reminder for me as well as for others.
@crash Addendum: Sometimes we think we have the high ground and discover that we don't. It's important to be able to reverse course when that happens.