Occams Hatchet and Is Materialism "Special"

[bennyboy]

You're too cryptic for me to make out here.  What reductionist objection are you referring to?

The interaction problem, i.e. that if material substances and mental substances have entirely different natures then they cannot interact without appealing to a third substance that in turn requires a fourth and fifth intermediating substance, and so on and so forth. Similarly, if A is considered the cause of B because B habitually follows A and if only events qualify as causes, then either B follows A for no reason at all or there is an intermediate cause C...and so on and so forth.

What's your take on that argument, because it's my reason for favoring idealism over substance dualism.