Divis, the European Court did rule that use of white noise and light was torture, so it was quite rightly stopped.
Before that most countries would have regarded it as acceptable for interrogating war prisoners (which PIRA wanted to be).
Remember, people were not being tortured for their political views.
At the height of the troubles, declaring any view was perfectly legal.
The issue was detonating car bombs in town centres and shootings on the street.
A failed interrogation meant more violent death.

Jean McConville was drageed away from her terrified children, tortured, mutilated, and then killed by YOUR local PIRA unit.
You have dropped heavy hints that you were a member.
You are in NO position to lecture anyone on the treatment of prisoners.
You would not even tell her poor family where you dumped her body.