I think it depends on the situation. Yes, some babies cry purely for attention, but if they're crying constantly then there's a good chance something is actually wrong. I've babysat a spoiled baby and had to teach her to self-soothe, which I think is very important for a child's growth. At first she cried a lot, particularly at nap time, but after a while she stopped crying as much and generally seemed much happier. My niece on the other hand cried non-stop. My sister-in-law took her to their doctor who said she was just high maintenance and to just let her cry. Because it was more than that she didn't stop crying, and ultimately holding her didn't help either. It turned at she had major stomach issues and needed surgery. So while I am an advocate of self-soothing, I would say that if they're crying "constantly" it's probably more than just a desire for attention.