Destruction is easier than construction, that's physics.
Which makes it always cheaper to prevent and not do the destruction in the first place, but we're going to keep polluting until we can pollute no more except we'll always be able to pollute more, because it's easy. The consequences aren't.
The gun crowd bring it up only to do nothing about it anyway. It's just something to blame, they don't want to fund healthcare, education, research and welfare, and lose their scapegoat.