Why not have a more useful title, since many viewers (including myself, for a moment) won't know what you're getting at. Since the guy on the left seems to qualify what he says, he sounds intelligent and open-minded and reasonable. Thus the viewer accepts his 'fact'.
I thought the point of the video was that those on the political left were basically indicating that all gas pipelines should be shut down everywhere, since we drink the groundwater everywhere.
For those viewers not in the know: Gasoline is lighter than water, and rises to the water surface. Not just toxic, but extremely dangerous! And gas fumes are heavier than air, so they sink to the ground and concentrate just above the ground, waiting for a dropped cigarette. Also very dangerous!