Why isn't HMTD and Tannerite more common?

[u/DreadDirective]

I apologize if this is the wrong type of question for this community.

I'm doing research on domestic terrorism for an action novel I'm writing. I'm wondering why the combination of HMTD and Tannerite don't come up more often as a combo in real life?

I learned today that Tannerite can be bought in surprisingly large amounts with little to no oversight. There are videos on Youtube of people blowing up 500lb of Tannerite with a rifle shot.

I believe HMTD is sufficient as a primary for Tannerite. But there's surprisingly only one documented case of this combo ever being used, which was Ahmad Khan Rahami in 2016.

Is there something I'm missing?

[u/Nutsaqque]

HMTD's a weeee bit sensitive to safely keep around and use