Caught that story. You make a good point, about the neighbors, but guess who the neighbors where? The complex is said to be heavily foreign students, with JH living in the mostly Muslim area.
"The complex is said to be heavily foreign students, with JH living in the mostly Muslim area."
Between the Pakistani roomie and the Muslim neighbors, who would logically have had to know due to the reportedly strong odor, you'd also logically have to circle back to Hinrichs being involved with radical Islamists, somehow, if he was "cooking" TATP in that apartment.