Because it's the classic internet overreaction to things to start an online petition thinking it'll, somehow, get a business to care and make a change. The petition has no chance of working, no on-line petition for anything has worked. Companies just aren't that swayed by a list of mostly anonymous "signatures" on a website.
I see on-line petitions as not much more than someone pouting and stomping their feet. On-line petitions are another modern-day society release valve, sort of like the "close the doors" button on an elevator. It actually does nothing but it makes the user feel like they are in-charge of something. It's a placebo.