Spend 5 minutes at my house and you will certainly NOT think dogs wearing clothes is cruel. Mine actually LIKE it for the most part, I have a few girls that came from outside kennels and they STILL hold up their head to put their little shirts and dresses and sweaters on. It keeps them warm and does not bother them a bit. Now the shoes mine DON'T like, so I don't put them on, but there are some babies that don't mind.
With all the homeless and abused animals out there, I think they should redirect their focus. SURE there are people that buy dogs as simply fashion accessories, and no that's not right, BUT to put everyone who dresses their dogs up into that category is just...ignorant.