The big thing about decompression diving (although it's a misnomer, because all diving requires decompression) is that when you reach a point where a direct ascent to the surface is no longer an option you can use without significant risk of injury, you now have to solve all your problems underwater. This requires a degree of redundancy in equipment, as well as a great deal of training and a lot of composure. In the vast majority of cases, if a decompression dive is well planned and precisely executed, it will go without incident. But just as there are "undeserved hits" in recreational diving, there are injuries from technical diving which are hard to explain. The stakes are higher, because the nitrogen loading is greater.
There is also a lot to understand, to decide how to plan such a dive, what decompression strategy you are going to use, what gases you are going to carry and how you are going to use them.
But the bottom line in all diving is that each of us must assess the risks involved in what we want to do, and decide if it's worth it. The important thing is to have enough education to understand fully what those risks ARE before you undertake them.