Three strikes programs aren't laws in most cases - they are agreement between corporations and other corporations which don't respect the ideas of the people subject to those agreements.
And in cases where they ARE laws, they punish whole families for the actions of a single member. By your thinking, I would expect the whole family of a murderer to be sentenced to death or life imprisonment.
The fact is, 3 strikes laws/programs aren't a deterrent and they don't respect the fact that most who pirate music/movies spend more money on music/movies than those don't. It's backwards, archaic refusal to evolve.