To write that a thing cannot love is to write that we fear that thing; that something in it is something we cannot grapple with; that we must shut down our empathy as we approach that point, project thingness onto it, deny it, hide from it, shut ourselves away inside ourselves and speak such words of it. We dare not love it, so we say it does not love.
Of course demons can love.
Hrm. Though I may have written myself into a corner here, vis-a-vis kleenex, tea, and tables.