Barracuda tire Question

How does 215/60/15's fit for some and not for others? There are some guys running 215/65/15's on the front on this site. I don't understand how some tire sizes fit some cars and not others.Why are johnnycudas tires rubbing the front fender and not anyone else. I know it could be an alignment issue/after market rims on some but I just had my car aligned.