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What you describe is an important dichotomy that is always important to keep in mind for Chaos corruption; the mental versus the physical.

On one side we have the pure honest temptations and bribes of Chaos. This is the sort of stuff they mean when they say no Grey Knight or Sister of Battle or Custodian or whatever has ever fallen to Chaos.

On the other extreme end of the spectrum we have a Chaos Sorcerer pointing at you and turning you into a betentacled insane mess with a spell. Very very few things in the setting are immune to this sort of thing, not even the likes of Necrons. Blanks can resist many forms of it, but drop Jurgen the Blank into a warp rift and he'll find that his resistance has limits.

Despite their physical resilience, due to their harrowing, mind-mutilating psycho-indoctrination the Space Marines seem more vulnerable to the latter type. This is shown well in the Abyssal Crusade which saw nearly 30 Chapters turn to Chaos at once.

Just as a side note, I am reminded of a blood bowl comic/story/thing I read where there was a cult of nurgle that did... ehm.... things you would expect from slaanesh, as a way to spread disease.