This is truly tragic and I share the OP's sentiments...I would personally not feel comfortable doing this but we must be careful not to make choices that other people are quite capable of making. I do hope she (and he) fully understood the risks and chose to participate on an informed basis, but if they did so, we shouldn't second guess. Life (and enjoyment of life) involves risks. Sometimes the dice come up the wrong way.
FS:Sub Amp - works w/ Technic harness! MRD-M300 - cheap