Using logic illogically

There's an interesting post on the Milwaukee Biz Blog by Tom Barrett. The post deals with some, as he calls it, fried facts (I'm not sure what that means . . . ). One issue I have with Tom's post is the information he doesn't tell you which is revealed by a person who responds to his post. The article is here.

The post deals with the 27th street off ramp that is to be closed with the I-94 expansion from the airport south. But none of this is really the point that I'm trying to get at. In the article, Tom defends closing the 27th street ramp with this logic:

This is an important point, because the access points that will remain open to 27th Street are those most heavily traveled. According to information from our city engineer, approximately 16,000 vehicles exit I-894 via S. 27th Street every day, but only 1,500 of those cars – less than 10 percent - utilize the exit that would be closed.

First off, 10% or not, 1500 cars is a lot. But, again, this isn't the point. If 1500 cars a day, or 10%, isn't enough to justify keeping the ramp, why is less than that (in terms of transit numbers) a justifiable reason to persue rail?