[dTal]

There are many shades of meaning to "vice"; it broadly indicates a weakness of character, not necessarily to the extent of making someone a bad person. If you know that alcohol is bad for you (and the people around you) and should not be drunk, and yet you drink it anyway simply because it feels good, is this not a failure of self control?

[shard]

Although the slippery slope is a fallacy, down the road you speak is monkhood and the productivity optimization cult of recent times.