A scientist tries to unravel problems or identify new findings. Or so the idea goes.
Anyway, it is sometimes hard to find a "spectacular" or "breakthrough" problem to work on. It is often easier to find a simple problem to work on, making small, incremental, but sometimes inconsequential contributions.
On the other hand, while working on "breakthrough" ideas, you could sometimes come up with a hypothesis that is totally, absolutely wrong, and then waste years trying to prove it.
So, what would you do? Take a risk, make a prediction, take a stand and be spectacularly wrong, or be trivial, work on simple problems but with the comfort of knowing that life will be steady and without surprises?