They have hinted a couple of times at Dean's dark side:
#1 when in S3 he had visions of what he might become as a demon
#2 when he came back and had to admit he'd been a torturer and that he liked it. And now, he pretty much tortures at will, which I find very disturbing. The Mark could enhance that -- he has been pretty ready to kill recently.
#3 when he came back from Purgatory very triggery and ready to kill. They kind of backed off from that quicker than I expected. ...
#4, and of course, there is 2014!Dean, and seeing how it is actually 2014 now..... :D
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Date: 2014-03-05 04:54 pm (UTC)#1 when in S3 he had visions of what he might become as a demon
#2 when he came back and had to admit he'd been a torturer and that he liked it. And now, he pretty much tortures at will, which I find very disturbing. The Mark could enhance that -- he has been pretty ready to kill recently.
#3 when he came back from Purgatory very triggery and ready to kill. They kind of backed off from that quicker than I expected. ...
#4, and of course, there is 2014!Dean, and seeing how it is actually 2014 now..... :D