There are also various household chemicals which are capable of powering a bomb. And no, I won’t list list them.
While I agree with you, there are other household chemicals which, if mixed and delivered properly, could potentially cause many more deaths than a bomb/IED would.
But these sorts of attacks wouldn’t gain the spectacular media coverage that we see lavished on bombers. So they won’t pull off attacks with low intensity, lingering deaths in large numbers. Terr’s will continue to act out for the media.
Terrorists are, always and everywhere, political animals. They need the furor of the non-stop media coverage to gain traction for their causes. If we really want to stop terrorism, then we should make sure the deaths of terrorists are as ignominious and anonymous as we can manage to make them.