You can't trash the Chapel itself since it isn't in you hand when you resolve it. You could trash a different Chapel card if that card were in your hand.
In an article on Board Game Geek, Donald X. Vaccarino commented on the development of Chapel:
- This started out "trash any number of cards" and went to the ever-so-slightly weaker "trash up to 4 cards." I tested a version with "trash up to 3 cards." It was horrible. Just, way slower than the current version, like you wouldn't believe. 
Note: Strategy articles are not necessarily based on fact, but on players' experiences or simulation programs. Certain cards will be stronger in some set-ups and weaker in others.