Secularism's View on Evil

Secularism claims that evil can't be supernatural. But does that actually hold up to the human experience of evil? It feels like it so much more than this. A problem with secularism's view on evil is that its way too simplisitic. Most cultures throughout human history have had a framework of supernatural good and evil. So as shakespeare once said in hamlet, there are more things in heaven and earth, horatio, than are dreamt of in your philosophy. Also, that view is honestly just culturally narrow.