@sycastro: Yes, if you set “Settings => Discussion” and uncheck “Allow people to post comments on new articles”. This will only disable for new post/page. But for old post/page, you can do bulk editing and remove comments like this https://www.pinterest.com/pin/548594798333128024/. Editing comment.php should be done only from child theme. If you edit comment.php or any file inside ‘catch-responsive’ theme directory, it will be revert back to original when you update or upgrade the theme.
Note: Pro version has option to disable from theme options. For more about Pro version, check out theme instructions page at http://catchthemes.com/theme-instructions/catch-responsive-pro/