When did we fail going forward? As humanity, I mean.
There have always been people who opposed progress for various reasons, and sometimes their reasons were understandable and even forgivable. Nobody can care about everything at once in equal measure and sometimes the safest default is "let's not rock the boat when things seem to be going well."
There's one current obstacle to progress that I have a harder time forgiving, though. Every time there's discussion of the possibility of doing some research into geoengineering as a means to counteract climate change a whole pile of people come out with "but that will only encourage more burning of fossil fuels" and "haven't you seen Snowpiercer?" counterarguments. It's wearying. The same people usually love the "we've passed an irreversible tipping point" articles that go on about how doomed we all are and how futile any further attempts to reverse climate change are.
If they really think we're doomed and nothing more can be done, then get out of the way of the people who are still trying to come up with solutions. A generation ago the same problem prevented nuclear power from being a useful solution.