I don't think the analogy works either, but then...I don't think that was the point.
The point is we don't care that players and coaches are still trying in blowouts in baseball, basketball, or hockey....we don't care about blowouts in golf, and we don't seem to have a problem with the best in tennis humiliating someone 6-1, 6-1, 6-0....no one says, "Gee, he's got the thing won; he could at least let the other guy hold his serve a couple of times, knowing he'll win the set on his own next serve."
Maybe it's because football is such a physical sport that we think the best teams should ease up a little and just coast with big leads. I'm not really sure where this idea comes from, but I'm guessing more coaches stop throwing the ball more to keep the clock running and avoid making goofy mistakes or risking injury to their skill players than they do so out of pity for their opponents.
Let's face it....it used to be thought humiliating, regardless of the score, when team was so superior that they quit passing and just ran the ball down your throat all during the second half, grinding down your defense and never letting your offense on the field...that was painful to watch, unless you were loving your team that was doing it. Now, we actually want the superior team to just kneel down on 4th down instead of kicking a FG, and we certainly don't want them running the ball, a play that used to be considered merciful.
You know what....I just have no sympathy for a team that can't even stop the run when they know it's coming, and I don't condone my team kneeling down to avoid another first down or score.