Like Lady Goldberry said, Tom Bombadil is.
That's all there's to it. Hobbits, like all other Men, just have a habit of searching for an answer, even when one is not needed or available - which is logical, considering they don't have millennia to ponder the enigmas of Middle-Earth.
But yes, Tom Bombadil seems to be the epitome of one of JRRT's ideas about nature.
Quote:
But, I like your thoughts that he may belong in an asylum
That's exactly what Tom Bombadil's land was. It was an asylum, where the Hobbits found shelter against the storm for a short while, before again weathering it. It would be the last part of Middle-Earth to fall, if Sauron would've been victorious.
Regardless of its usually pejorative connotation, an asylum is a place of protection, a sanctuary. That's the original meaning, coming from Latin.