These easier-to-answer questions are susceptible to making an investor feel better about investments surrounded by enthusiasm (and enthusiastic prices) and worse about opportunities created by fear and pessimism. But, of course, such an instinct is the opposite of what often leads to good investment returns, namely buying when others are fearful and selling when others are greedy.
The double-whammy with this inclination to unknowingly substitute hard questions for easier ones, is that once people form an opinion, they are wired to fortify it like a castle. People favor news that supports their opinions and prefer spending time with people that share their views. Likewise, they tend to avoid and discount information that might challenge their beliefs. This tendency is often called “confirmation bias.”
Why would this quality have survived across the evolutionary process that made humans what we are today? Evolution is supposed to pass on genes that are helpful to survival! Shouldn’t confirmation bias eventually have disappeared as our human software was progressively refined around making great decisions based on all available information? Perhaps the following perspective, from the cognitive scientists Hugo Mercier and Dan Sperber, explains why this question is naive.
“Humans’ biggest advantage over other species is our ability to cooperate. Cooperation is difficult to establish and almost as difficult to sustain. For any individual, freeloading is always the best course of action. Reason developed not to enable us to solve abstract, logical problems or even to help us draw conclusions from unfamiliar data; rather, it developed to resolve the problems posed by living in collaborative groups.” 
This makes sense. For example, if you lived in 16th century Italy, you might be more successful in school and in life if you embraced the idea that the world was flat. To challenge accepted wisdom (“the world is not flat!”) might get you excommunicated, or worse. There is always some safety that comes from sticking with the crowd. And, if you are wrong, well, there is comfort in having been wrong with company.
However, in the world of investing, we want to succeed, and the comfort of failing conventionally is bittersweet at best. So, as one seeks neglected, or misunderstood, opportunities that are favorably priced, it is hard to imagine a more severe design flaw than confirmation bias. In the public markets, outside of inside information and fast trading capabilities, generating exceptional returns requires contrarian views formed through better analysis of the facts, and the conviction to sustain those views despite overwhelming pressure to conform to the crowd.
It is therefore crucial to protect against both our ingrained difficulty seeing what we do not want to see, and our great ease embracing further what we already believe.
Right up there with embracing stories that confirm existing beliefs is our tendency to expect whatever we have recently encountered to persist in the future. When things are going well, we tend to expect them to continue going well. The flip side is also true.
“A person who has experienced a tragedy will overestimate the potential for risk, danger, and a hostile universe. A person untroubled by suffering will underestimate pending danger. When a friend gets cancer we get a check-up. When nobody we know gets cancer we ignore the risk.” 
Right now, with markets and growth stocks having been so strong for so long, investors are wired to expect things to continue on their current course. But, markets are forever cyclical. Long-periods of strong results tend to be followed by poor returns and vice-versa.