Lack of common sense at the ACLU

The ACLU fights for the civil liberties of all Americans. I have been a staunch supporter of their protests against the Patriot Act and push for greater separation between search and state. The ACLU needs to pick their battles wisely, in Boston they are currently challenging Logan Airports "controversial" use of behavioral profiling when identifying potential evil-doers. When the ACLU contests programs that are inherently logical it only serves to diminish their standing on other fronts. I can't understand why the ACLU would take issue with police interpreting behaviour as a method for identifying suspects. In subways it is regular commuters who are asked to report suspicious activity, at least the police have some training...