IMHO yes. Considering areas of Evil outside the Natural is irresponsible.
Let me try to explain why.
As I have gotten older I have been forced to realize two things, that there are some things that really are outside my control, and that I have limited energy to expend.
By definition, anything SuperNatural is outside my control. I cannot do anything about it.
Effort spent worrying about the SuperNatural is simply effort not used in areas where I actually can have some influence.
The whole area of "...being open to the concept that there is evil beyond our own in this world, and to address this possibility of evil..." simply seems like a royal waste of time and effort.
Yes, I do think that is irresponsible.
Aslan is not a
Tame Lion