The "wolf in sheep's clothing" is an idiom of Biblical origin used to describe a character with whom contact is dangerous. The phrase originated in a sermon given by Jesus stating, "Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves." (Gospel of Matthew, 7:15 - King James Version)
The problem with a wolf disguised in sheep’s clothing, is that ultimately, the wolf always shows his true colors. It never ceases to amaze that one can be so drawn in by the one sheep so cleverly camouflaged – the one who walks the walk and talks the talk but in the end, turns out to be the biggest wolf of all. Why can’t this particular sheep just be straightforward and honest; present themselves for what they really are and allow those gullible enough to believe to be drawn in? At least one could say, I was a fool but with eyes wide open and knowing what was to come.
Now the other kind of wolf gives no pretense. Truly, there is something to be said for this wolf - the one that comes right out and presents himself as, a wolf. With this particular fiend, you know where you stand and you know exactly where you are going to end up. The predicament is that you will undoubtedly be devoured. The fortunate thing is that you knew it was coming all along, and still, you stayed and enjoyed the game.