What's the use?

Why do I have fingernails? Honestly? Are they the vestigial remnants of some awesome Velociraptor-esque claws? Did they elvolve to serve as protection for the tactile recptor/fine gripping apendages that are my fingertips? Either way, they suck. They are a pain to keep short, and the only time I ever even pay them any mind is when one gets ripped back and i jump around screaming like a school girl till i can find a power rangers band-aid to put on it.

How can i engineer a selective pressure to get those claws back? I think that right now it would be much more useful having razor sharp shredding devices attached to my hands than what i've currently got.