One issue is that laymen know enough to not trust that switches are true kill switches, but don't generally have the skill set necessary to verify for themselves what their hardware has in that regard.
A piece of tape is a very low technical skill system that you know will cut off a video feed.
Transparent casing with the wires running to a slightly to large mechanical toggle switch that switches all wires. Then it looks like someone went out of his way getting it right.
A piece of tape is a very low technical skill system that you know will cut off a video feed.