It's an argument that crops up every now and then: the advances of modern medicine mean that "less fit" individuals are no longer selected against, and therefore evolution has stopped working in the human race. Well, there are quite a few things to be said about this argument (including that it's mostly wrong), but as far as proposition #2 is concerned, the one that matters is that it forgets that natural selection = ecological selection + sexual selection. Even if ecological selection were out of the picture (and it's not), sexual selection would continue to shape human evolution.