You were looking for some reasons to not eat gelatin, right? Well, here are some reasons that I don't eat it:
1. It is made from boiled up bones and hooves etc. from dead animals
2. Reason no. 1 is pretty gross
3. I don't know if you eating one pack of poptarts that contain gelatin will contribute significantly to the meat
industry, but when you add up all the packs (and other things) you eat over your lifetime, this probably will.
Also, a lot of animal byproducts (such as gelatin, blood etc.) are classed as hazardous waste (at least in Europe), so
if the meat industry did not have a purchaser for them (such as the food industry) they would then have
to dispose of them in a specialist facility, such as an incinerator, which would increase the cost of producing
the meat, which would be bad for the industry. So if you don't consume products that contain these
ingredients, you will decrease the market for these products, which means that less will be made, less
byproducts will be bought by the food industry, etc. (sorry this is getting very long-winded and hard to
follow - it makes sense in my head though!!)
Basically, what I was trying to say is if you don't buy products with animal byproducts in them, the meat
industry _will_ make less money.
I hope at least some of that made sense!