you didnt answer the question, you simply redefined the term...
where in the definition does it say that the govt/group is to protect you at every turn?
where does it say that protection from the group replaces personal responsibility?
personal responsibility in a social contract is to contribute to group safety...
nothing 'replaces' anything
in hobbesian terms you can reserver the right to exit the contract if you feel threatened but you must accept that your life could be in jeopardy in doing so... of course i think hobbes was an idiot (all of his beliefs were founded on his religious upbringing which was seemingly unhealthy (potentially abusive)) but he did have some interesting thoughts...
and from a hobbesian perspective (in Leviathan) a social contract MUST be ruled by an absolute sovereign
http://en.wikipedia.org/wiki/Leviathan_(book)Hobbes, Locke & Thoreau were largely differentiated based on their thoughts around the level of control required by a government... again all 3 men were interesting idiots (Locke was a puritan, Thoreau was a liar and a wimp)...
Rousseau, Montesquieu & Voltaire took a different but also interesting approach when they evolved the social contract into a 2-way street where 'subjects' had defined liberties (contributing the the american and french revolutions among many other things)...
all of this is far more than i really want to debate on a saturday morning... but all of them considered libertarian ideas to be fancies of the rich
Kant, Hegel and Mark are more to my taste...
but again... this is heavy shit for a saturday morning