Is it wrong to want something you now is bad.

Why is it everthing you now u don't need is the very most thing you want (desire).

i didn't get your point, if you give me an example or explain more i may answer

its human nature to want what you cant have
or to want what you know isnt best for you,
its called curiosity.
And its your decision whether you'll let that curiosity get the best of you, and take the chances of getting hurt...

Curiosity killed the cat but satisfaction brought him back. Reality can screw up a good fantasy.