Food Coloring

why do so many products, (even my folic acid vitamins) have food coloring like:

FD&C Blue No. 1 - Brilliant Blue FCF, E133 (Blue shade)
FD&C Blue No. 2 - Indigotine, E132 (Dark Blue shade)
FD&C Green No. 3 - Fast Green FCF, E143 (Bluish green shade)
FD&C Red No. 40 - Allura Red AC, E129 (Red shade)
FD&C Red No. 3 - Erythrosine, E127 (Pink shade) [4]
FD&C Yellow No. 5 - Tartrazine, E102 (Yellow shade)
FD&C Yellow No. 6 - Sunset Yellow FCF, E110 (Orange shade)

(thanks to Wikepdia)

Why do manufacturers of chocolate feel need the need to add food coloring to chocolate which has a beautiful brown color? It's not brown enough for them?

It;s getting hard to find products with out artificial food coloring in it. They should follow Dancing Deer's example of using natural colors in their icings and Yummy Earth and Pure Fun's candy. They use coloring from vegetable coloring. Vegetables have beautiful colors.