I only want to add as far as Druids having Fire Magic goes, it actually does make sense that Druids have fire magic. From a roleplaying perspective, dungeons and dragons sort of set a precedent upon which many classes in EQ are built on, and that and many other reference material druids would wield fire magic.
As far as nature-lovers wielding fire magic, I present the argument of controlled burns which are necessary in forest management.
https://en.wikipedia.org/wiki/Controlled_burn