[quote=@thewizardguy]
 They also use fire because..... well, because Inferno Tanks are just badass. No two ways around it, that was added solely for the badass factor.
[/quote]

There's also this:

[i]And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; [b]and out of their mouths issued fire and smoke and brimstone.
[/b].

-Revelation 9:17 KJV[/i]