The amount and type of toxic elements going down the rails and our highways would make us all run for cover if we knew about even a small portion of it.
How many times do you read about a tanker truck or railcar carrying ammonia which overturns and causes the evacuation of tens of miles of the surrounding country. The neutralized agent would be similar to spilling drain cleaner if it inadvertently spilled. There are several methods available to neutralize the VX agent (which is similar to antifreeze in consistency), Sodium Hydroxide (strong bleach) is not necessarily the best, but it effectively removes the threat of the neutralized agent for the public.
The opposition group mentioned opposes any destruction involving incinerators and would prefer the U.S. Government spend billions of taxpayer dollars to build something which is really unnecessary for all practical purposes.