[wahern]

They're not convinced that it impairs their driving.

Consider that a plurality, if not a majority of the population is convinced that they're efficient at multi-tasking, and specifically that they can perform each task as well as in isolation. But we know that almost nobody multitasks well, period, and absolutely not with equivalent performance.

[mrguyorama]

Don't forget that a vast majority of the population thinks that they are above average at $TASK, no matter what it is