Art the Clown is back! Or, is... in his first outing! Depends on where you put the previous Damien Leone shorts in the hierarchy, but Terrifier is a (blog post) full 90 minute romp where Art the Clown does what Art the Clown does best. No, that is not explain his motives in the slightest.
Source: horror movie Terrifier Movie Review - Decker Shado