All strategies will require making tough and unpopular decisions at times.
The message I take from this has to do with staying disciplined and faithful to a strategy you believe is best for your long term goals.
As we've talked about many times since the beginning of this site, no strategy can be the best for all times but many strategies can get the job done in the long term. This has been a great year for indexers, really the last couple of years. The previous decade was lousy for indexers. In the future there will be periods that are again not good for them and periods like now that are.
Indexers know they will have a tough time in decades like the 1970's and 2000's and even during fads/manias. The 2000's were tough because not much progress was made which can lead to impatience. The late 1990's were tough for indexers because other people appeared to be getting rich buying stocks like sock-puppet dot com and making 1000% in two months which again can lead to impatience.
Any strategy with a reasonable basis for working will at times be the best but there are times where it will not. Once you figure that out it will make it easier to remain focused on whatever is important to your long term goals.