This argument pops up frequently, but I think one of the posters had it right...it's what you do with the creature that makes it evil or not. Pathfinder has removed ALL references to casting evil spells as being evil acts.
Usually the proponents of the [evil] spells as evil acts (reflexively, without thought as to how the creatures are used) are capricious DMs who like to use alignment as a hammer against their good-aligned PCs.
After many discussions with my long-time gaming group, the idea of inherent evil does seem built into the game. i.e. it is a good act to harm evil creatures. However, other than [aligned] spells and divine casters of opposing alignments, it seems that there are plenty of spells with out [evil] descriptors that should effect an individuals alignment.
The whole school of enchantment basically takes away freewill or enslaves intelligent beings. In the majority of my games slavery is the go to for evil acts.