[wutbrodo]

You're right I did switch the wording there, but in my view it was only to clarify. I didn't consider the fact that you would see a difference in meaning between the two phrasings.

I literally see no difference (beyond the latter being slightly clearer) between "I can't see why X happens" and "I don't understand the valid reason why X happens" (where X in this case is "people being interested in pro sports"). As such, I didn't consider switching it out to change the meaning at all beyond slightly clarifying.

The connotations you refer to are also ones that I don't think the original phrase is laden with. I really don't see how "I don't see why X" connotes a lack of attempt to do so, any more than "I don't understand why X" does.

I'm aware that now we're getting into differences in connotations where there really are "no right answers" (unlike the denotation, we can't just look up a single source of truth). Apparently we've just been exposed to rather different vernacular, at least with respect to these couple of phrases. I guess that makes us "both right", with respect to the "languages" that we each speak.