Testimonies of those who have been bitten or pinched exist, but their pincers are not intended for use against humans. Their pincers designed for use in defense against other earwigs (males fighting for females) as well as against predators in self-defense. The pincers also help the earwig fold its wings to close them.
They do have wings, but rarely fly. Adults of this species tend hide under objects by day, and sometimes in clusters. Lifting rocks, logs and BBQ grill covers may reveal a group of them. They can crawl into small spaces like outdoor garage door openers and outlets, startling the unsuspecting human that opens the lids.
They are considered somewhat beneficial in gardens because they eat aphids. However, if insect prey is scarce, they may eat the roots of planted flowers (in containers as well as in ground). They will also nibble on the flower blossoms of fruits and vegetables, making the produce inedible. In such a case, they become pests. Their population numbers swelled so rapidly in Portland, Oregon back in 1924 that the city declared a state of emergency. The European Earwig was decimating its crop and fruit tree harvest and measures were taken to eradicate them from the area. These days, they are not likely to pose such a threat and are mostly contained in backyards.