Etiquette

The trend of putting decals on the back of your vehicle that represent your family kinda snuck up on me. Granted, lots of trends sneak up on me - it's 2009 and I've never heard any music by Kanye West or Radiohead, and I'm not sure what "The Hills" is about - but this trend strikes me as a trend that's fraught with etiquette issues. For example:

1. When a family breaks up, which parent gets to display the child on the sticker?
2. When you have a blended family, should the children be shown next to the parent that sired them, or in a group with each other?
3. Can you keep the sticker on your car after Child Protective Services takes the child away?
4. Is it bad form to display decals for angel babies? Should said decals have wings and halos? Would it be the most obnoxious way to make money off of miscarriages? (Probably not.)
5. Is the next step decals of caricature portraits with giant heads and tiny bodies holding objects that represent one's personality?