Comment:No, my dear fellow, it doesn't implode at all: necessity (along with all of it's teleological unfoldings) were deeply analised by Sartre in his "Critique of Dialectical Reason", in wich he worked with the concept of engagement, establishing prolific dialog with marxists and neo-marxists. It's exactly in that moment of Sartre's philosophical development that what you've called "anathemas" (essence, necessity and causality among others that populated his "NAUSEA"/"Being and Nothingness" 1938 to 1943 period) were deeply dialecticized with moral and political concerns! So, what i meant by "totally necessary" is apropriately attached to that specific period! For further clarifications on this issue, i recommend Sartre's "Existentialism is a Humanism" (available at: http://www.marxists.org/reference/archive/sartre/works/exist/sartre.htm) and the 6 part BBC documentary available in Youtube on Sartre's life and work (http://br.youtube.com/watch?v=cdKx71XD4Ss&feature=related). I believe that you'll enjoy it very much! And there's also another documentary from BBC dedicated to Heidegger wich i believe that will please you even further!:-)
Description:Sartre's famous lecture in defence of Existentialism This may be from the website's own description.
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