SVO is hardly suitable alternate for CX at about 0400am in the morning.
But emminently suitable in an
emergency, one assumes. Either the situation warranted an emergency landing or it didn't - apparently the latter.
I doubt anybody disagrees with the policies of not accepting (CX) or departing with (DTLR) unaccompanied bags. The mere existence of such policies does not prevent it from happening, clearly. Turning around just for the sake of policy (absent real threat) seems over-amping things a bit
on the face of it.