People organised enough to address their grievances through the political system are capable of building vastly more powerful explosives, ammonium nitrate doesn

People organised enough to address their grievances through the political system are capable of building vastly more powerful explosives, ammonium nitrate doesn't compose a critical part of their supply chain. For those who it's not an option, or for those who find the option unpalatable, it's highly questionable whether not being able to get the right kind of fertiliser's going to stop them - especially when you consider how easy ammonium nitrate, and other precursors to more significant explosives, is to make.