Yep, seriously. Consider the chaos monsters and mages the Empire embraces, not least Sedenya herself.
Heads on your belt? Why should I care unless my cult opposes Chaos or one of the constituent parts of Thanatar?
On the other hand, if you favour Krarsht you are undermining society. If you favour Cacodemon you are promoting cannibalism. If you favour Vivamort - actually, okay, the empire has a Vampire Legion, so everything is fine, yes?