> Science evolves as does technology, and inevitably both factors will change over the coming decades. To base your life around the worst case predictions of models (where the disaster moment keeps pushing back as time progresses) is not logical.
Operating on the basis of the most extremist "worst case" scenarios that are very unlikely (like your "peak oil" example) probably doesn't make too much sense, but it's probably not a bad thing to be rather pessimistic about these sort of things when making policy.
We can take no thought for the morrow and trust that future technology will sort it all out. Maybe it will, but what if it doesn't? There are no guarantees and hard constraints on our physical universe and planet. It certainly wouldn't be the first time in history human-made ecological changes caused large problems.
Or we can be more pessimistic today. Maybe it will later turn out that won't have been necessary, but it still would have been the smart thing to do as a matter of risk management, since we couldn't have known in the past how things would work out in the future.
As with all things, you can of course exaggerate, but it's a mistake to throw our the baby with the bathwater because some extremist said something extreme.