Astma research is generally done on animals, because to study it, you either need to cut their larynx open or induce an astma attack, which is, in human terms, assault, and probably murder by the time you are done.
In Farenheit 9/11, Michael Moore, irritating though he is, made the point that only one person in Congress (or maybe the Senate, I can't remember) had a child serving in Iraq.
Do you think an animal rights protester would offer their child for medical research?