WayneLigon said:
if it has an 'Always [alignment]' then all creatures of that species are born that way and cannot, without extraordinary means such as a Helm of Opposite Alignment, change.
Actually, if the creature has an "always X" alignment then:
"The creature is born with the indicated alignment. The creature may have a hereditary predisposition to the alignment or come from a plane that predetermines it.
It is possible for individuals to change alignment, but such individuals are either unique or rare exceptions" MM p. 305, emphasis mine.
RAW, Trolls are
usually evil so they aren't born that way. The DM here however has changed that so it has lost some of its effectiveness as a guide.
To the actual question, I think what kind of Paladin your player is playing should help decide. A lot of times, people think all Paladins should be the same in attitude and ethics - you see one, you've seen them all.
I really don't think that is the case, Lawful Good is an alignment - it is just as open to interpretation as any of the others. No two people have the same personality and that makes it really hard for them to behave the exact same way in given circumstances, impossible I'd say.
Same thing goes for the Paladin code: you can have a Paladin whose interested in jumping into the most evil pit she can find and make sure she is the only one to walk out again. You can also have a paladin who'd rather spend his time teaching - guiding people into the path of good. If they met, they'd probably disagree on a few things.
In the end, there is no one "right way" to be a Paladin. Don't get me wrong, there are most definately "wrong ways" to be one - and you have to watch out for it in all cases. "Smiting" paladins have to watch their zealotry and make sure they don't go after someone not because they are evil but because they are "not as good as me." Redeeming" paladins have to ensure they aren't being hoodwinked into letting evil slip by them.
As for the "scrag-poles," the main thing for your paladin is that
something has to be done. The infants can't just be ignored or left behind - they must be dealt with. As long as the paladin does that, in whatever way, then its clear.
I dunno, maybe Paladin dilemmas should focus less on what they must do and more on what they musn't do.