Petro is practically safe compared to ammonia. Petro only explodes in specific air-fuel situations. The vapors are harmful, but not deadly in small quantities like ammonia is. Calling petro "insanely dangerous" is wrong. Petro is the most dangerous substance normal people handle in quantity, but we allow normal people to handle it in quantity because it while it isn't safe it isn't all that dangerous.

Your standard household ammonia CONCENTRATE people sometimes use for cleaning is 99% water - you dilute it significantly for use. Even used correctly it is nasty stuff.