I used to work with a guy that was military trained expert in improvised explosives.
He said there was enough explosives in your average grocery store to pretty much level a city block with explosions or the resulting fire from the explosions.
You really want something powerful you would need to go the drug store.
So are we going to have a seven-day waiting period for cleaning supplies now? Or a license to buy fertilizer? Background checks for private ammunition reloaders?
Or instead: are we going to stop surrendering our liberty and admit that the enemy of America and the enemy of Western civilization is Radical Islam and that it is almost uniquely responsible for terrorism across the globe today?