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@Best.Korea
I can prove to you (and everyone else) that they value their own liberty.Yes, but valuing liberty over life sometimes results in destruction of life and then the liberty gets destroyed too.
If the end of life was a freely chosen value, it's end is an expression of liberty. No one lives forever, and by the same token it is incorrect to say the dead are being oppressed because they are dead. If there is no mind left there is no self-determination to violate.
One could say it is healthy to value continued life for the sake of other values, I would. However this is not an absolute rule. If it was there would be no moral way to go on a suicide mission to protect liberty (or the lives of others for that matter).