I take it "life" being that my life is my own and should I choose to end it early, that is my choice to make and mine alone. I don't know what you would define "liberty" as, but I define it as self-determination without being beholden to another. As for "pursuit of happiness", one man's vice is another's virtue. If you choose to make these decisions for others, then according to our founding fathers you are usurping God's plan for all humans.
If our inalienable rights can be abrogated then they are not really inalienable. We can infringe on our own inalienable rights, but we may not abrogate them.