I've been thinking about Into The Fire and the concept of burning, flames, and fires since the song regained some interest in The High End Of Low topic on alternate versions. Some people have discussed the lyrics, specifically 'Rapist Werewolves' and 'god pissing', both of which I enjoy.
Whilst touring the record, Manson said this:-
"Everything is a mess, I'm not the janitor.
You can just watch it. I'm just spitting, I'm just pissing on the fire of garbage."
MM . 2009, FuseTV
The quote would imply Manson was taking a god-like stance for The High End Of Low, a god that no longer cares about what it created, happy to watch everything burn, like Nero. Then consider the trajectory from this, to Born Villain, when Manson was photographed as Mercury once again, and Overneath The Path Of Misery; "Stare into my Kodak Rome Jack-hammer ice eyes", you can observe a slow course plotted by which he ascends to 'Emperor' status. His recent focus on familial roles is interesting as well, because Nero was rumoured to have murdered several of his family members or associates, and allegedly burned Christians just to keep his property 'mood-lit' - this also reminds me somewhat of the Red Queen having the headless hanging in her garden, and by association, The Gardener.
The stark image of Manson setting himself on fire for Born Villain relates well, especially in tandem with his Shakespeare recitation; "All our yesterdays have lighted fools the way to dusty death. Out, out, brief candle".
Twiggy, his 'twin' playing 'fiddle' as the world burns behind him:-
Into The Fire isn't the only song to feature prominent fire iconography on The High End Of Low, I think Running To The Edge Of The World is significant also; "If god crossed us we'd take all his drugs, burn his money and his house down, and wait for the fire to spread. But sometimes hate is not enough to turn this all to ashes."
That configures pretty well with the Nero comparison, I feel. Follow that through again to Born Villain, and Manson says "So I burn, gotta burn it", during Lay Down Your Goddamn Arms, and "burn me into splinters" in the title track. I'm not merely trying to connect words, I think Manson has used the emblem of fire to describe destroying the way you once thought or felt, to emerge like the Phoenix myth.
Prior to Born Villain, I also noted that in the PEROU shoots, Manson looked similar to Heath Ledger's Joker, who during The Dark Knight of course, burns the giant stockpile of money; "Some men just want to watch the world burn". Manson has compared himself with The Joker recently, and I always felt that nihilism was relative, both visually and with Manson's discussion of money over The High End Of Low and Born Villain.
A brief summary, is that fire, for Manson, is transitory. He sees flame as something that enables creation, after destruction.
I hope some more thoughts are added to the table.