Idle mind.. why a devil's workshop? why not?

its quite common to say that when u r idle, the mind will try to come out of it by trying to find instances which are most easy to remember..and mostly they are those which the same mind would like to forget. How is that what is least wanted comes up first? is it another LIFO( Least Interested First OUt) phenomenon thats working inside? Well, its just that the mind takes so much effort in forgetting it, that it pays so much attentions to it, and thereby end up remembering most of it. How many of us can clearly narrate good events as we do for bad?.. Here's how I think we can cope with it. A workshop for a devil happens only when we actually indicate our thoughts by actuon. This is where we can exercise control. first, try to keep the mind occuppied. Of course, since we cant do that all ways, so we cant help getting idle for a while, and so we cant stop to remember what we'd like to forget... lets stop it with the thinking.. Its bad only if others know what you'r thinking.. and Thank God they cant unless you wish it to be.. so best to nip it in the bud!.. so will it become a devil's workshop?... we can have our say there!