Risk-taking and selfishness

Snow is falling in the Alps and so are skiers to avalanches. These are not just inexperienced tourists, but seasoned local mountain people as well, who seem to know the mountain better and are (seemingly) able to read its mind.

Problem is, no one knows for sure, and as my brother was recently telling me, these folk are irresponsibly selfish. He sure had a point. My sense is that any risk-taking always entails a certain acceptance of risk, so where do we draw the line as to what is too much risk and too much selfishness?