Just to expand on what Joseph was saying, like many of the great philosophical classics that are entitled "X & Y" (Appearance and Reality, Process and Reality, Being and Nothingness), and really mean "X is Y", Being is Time for Heidegger, in that it is because we have a future that we can project possibilities into, and strive with all our might to realize them (shaping the world in our image in the process) that our existence can have meaning. Our past makes our choices in the present meaningful as well, by grounding our priorities in more that simple randomness. And we are called to be who we authentically are in the process.
Now, Susanna was right that one can be authentically a Nazi, but that is a problem only if you expect existentialism to generate an objective hierarchy of moral values...which it never claimed to be able to do.
Dan
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