@mmjaeger, your problem is that get_the_ID() only works inside the WP loop.
try
global $post;
if ( has_term( $term->slug, 'resource_category', $post->ID ) )
however, adding a default value to a post that already has a selected category really should not have any effect, since something is already selected, unless I’m missing something, and if it’s a new post there won’t be anything selected so there will be no default value. Like I said, maybe I’m missing it and just not understanding.
