You've shifted from "I don't understand the argument."
to
"I don't agree with the argument."
These are two very different things, and I would have responded very differently if you had written the latter. More precisely I wouldn't have responded at all. There are lots of topics where my personal opinions are one thing, but I do understand people's rationale for believing something very different.
And most importantly, for my peace of mind, I try to maintain the humility to realize that just because I came to a conclusion doesn't mean I am a priori correct. I am not necessarily smarter or more well informed than the people with whom I disagree, so I maintain skepticism about how substantive my opinion is.
YMMV but this general concept keeps me mellower and happier than imagining I am somehow on the right side of every issue.