On my trip through PP at the end of August ranger went through the park spiel with a flip book of photos. She said "park policy is that TP is to be burned in fire pit or packed out."

If you have a fire going it's not a problem. If you don't have a fire going pack it until you do (or make a decent twig fire so that it is completely consumed by flame). Biological agents are destroyed by heat/fire (Remember the autoclave). It is their park, their rules. Quit whining and grab the birch bark.