It is not my idea, per se. I, like everyone else, has been conditioned by society, genetics, etc... I just do my best to be mindful of that. But most people agree what is hopeful (Star Trek) versus what is not (Terminator). Or even, a more granular example, The Empire from Star Wars, versus the Rebels.
Skilful just means "better outcome". If one outcome leads us to a nuclear war where everyone dies, vs a Star Trek future where there is little suffering, the more "skillful outcome" is the Star Trek future.
Hopeful messages balance the depressive messages in society. Which is where memetic ideas come in. Star Trek being a memetic virus.