Often times in life truth is painful. There is just no way around that and forcing someone to face the truth by any means can be considered torture if you press the definition to it's extreme. But that is in my opinion not the case here. How far do you want to go to protect the criminal or the terrorist? How much restraint should you show when you're dealing with someone like the Joker? Just how much bubble wrap should there be between them and justice? For truth is, if nothing else, justice.
In the Picard example the lasso has no meaning since Picard if wrapped up with the lasso at that point would have spoken the truth the same as he was before.
Forcing someone to tell the truth is not what I consider a violation of anything but the lie itself. If you deal truthfully with the world then the lasso is powerless against you. If you have something you don't want to say and not saying it will hurt other people then you are violating their rights to remain un-hurt.
It's very easy to wrap yourself up in moral knots to the point where you can't do anything to anyone. But it's not very practical. In the events of Identity Crisis what Z and the others did to Light was flat out wrong, but what they did to Catwoman later on was absolutely criminal and it would have been nice to have seen that explored. But it wasn't and as the writer's skip over an ignore all of this there isn't much we can do.