Dioxins are highly toxic and ubiquitous compounds that are unintentional by-products of several chemical processes on earth. According to the earth pollutant terminology, they are next to the nuclear catastrophes. It is because of their concerns over adverse health effects, a number of countries have introduced stringent emission standards.
“Burning vinyl is the most serious source of dioxin in the environment – whether from trash incinerator, house fires or chemical spills”, -- Eric Coppolino, writing for Planet Waves FM – Chiron Return.
”There are no coincidences in the universe, only convergences of Will, intent, and Experience” – Neale Donald Walsch
They were upset the cars did not rupture. They had to complete the task of this planned attack. Their excuse that the tanks would explode and send shrapnel all over was a total lie. The type of steel used for the tanks would rupture not produce shrapnel because it is a soft steel. If there was a pressure issue, the tank would have a pressure release valve. If the chemicals can't be release, there are special tank requirements.