morality/ethics and land vehicles

From the Subject Headings Manual, memo H 1095:

$x Moral and ethical aspects (May Subd Geog) (H 1998) Use under individual land vehicles and type of land vehicles, individual wars, and non-religious or non-ethical topics for works that discuss moral and/or ethical questions regarding the topic.

I was stopped in my tracks by this a few minutes ago. The red text is new. Why the heck would you need to add that this free-floating subdivision was used under individual land vehicles and type of land vehicles if it's valid under most non-religious or non-ethical topics. I guess if you're religious and cultish about your land vehicles, there might be confusion about the non-religious aspect. Or maybe land vehicles don't have a pattern heading so you have to be specific about some free-floaters. Cataloging is fun but sometimes inscrutable.