So? C4 is stable. You can even use it as a cooking fire. Done that. Besides, it can be handy to have around for removing trees, tree stumps, neighbors, and to celebrate New Year's.

True story: my nephew was working on PhD in chemistry. "His" chemical needed toulene to start the reaction, but it also produced more toulene as an unwanted by-product. He wondered how to get this out of the solution; I suggested he nitrate it and it would precipitate out. He thought a moment and decided that doing so would violate the Chemistry Dean's rather strict rules. No fun with chemistry anymore, I suppose. Ah, for the old days!