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I still think this whole discussion is because someone wanted to make a wizard healer and his GM told he would became evil. Anyway, after reading enough, i found my answer.
In my campaings, casting a [alignment] spell open your heart to planar energies of that alignment. You can do any action you want, but if you cast too much you lose control over your character aligment. Why ? Because i believe so. But i would never put a PC under a trap choice of having to cast such spell, and if there were a combo that he wanted to do, he would have to deal with it.
To me and to my campaings, Infernal healing is a lure option. It's a contract akin to selling your soul to the devil and gaining a boon, no one would sell a soul if the boon weren't a good thing. Selling your soul to the devil to save your children life still is selling your soul. Infernal Healing only means selling your soul in really small packets.
Casting a lot of Protection from Evil is opening your heart to heavens for protection. Is a contract as much as selling your soul. If you keep casting both your soul would be cut in half. Neutral power choose to become open to evil by being neutral, if they want good protection, they must open their heart to it. Neutral outsiders are beyond good and evil by their mysterious nature and can do some meddling without consequences.
Planar biding is a gambit, the angels let themselves be slaved, so they can change the caster from the inside to good.
This was my opnion if you want to play in my game, do as you please in yours. Thanks for reading.