^^According to legend, people who commit the sin of "Lust" must walk through a path of fire and brimstone.
Presumably, Lust and her minions are burnt by the flames of their passions.
As for the Sin of Wrath, the angry are dismembered alive. So I guess that's why they use Chainsaws.
Note that these are the original punishments for the Seven Deadly Sin in Catholic Mythology:
The punishment of Sloth is to be thrown into a pit of venomous snakes, for some reason they associated that with Envy on the Scare Zone.
The punishment of Envy is to thrown of into a lake of freezing water.
The punishment of Vanity is to be "broken" on a wheel (think of Ixion's punishment in Greek mythology).
The punishment of Avarice is to be dipped into molten gold.
The punishment of Gluttony is to be force fed toads, snakes, and insects.