You are correct… The scat category is a unique category that a fair base of our users do not want to see. For this reason, we have made it an "optional" category. To be able to view this category, simply click on your username in the top left corner of the page, then click "Profile Settings".
On the profile settings page, uncheck "Turn off Scat categories", then click "Submit Changes" at the bottom of the page. Once you do this, you will be able to see this category again. 🙂