You can take an unplayable lie in the hazard and drop the ball - staying within the hazard - and play from where you drop the ball, but you need to take the stroke penalty.

Sometimes it's advantageous to take the unplayable lie penalty. If my ball is in the sand trap and is buried near the lip of the trap and I know I have no shot I am almost better off taking the unplayable and moving the ball back in the trap to where I have a better lie and a better stance. Better to have a clean shot at it out of the trap, versus hacking at it and either missing or barely moving the ball from where it originally was at.

But any way you slice it you have to play the shot out of the hazard you hit into in the first place.

Don't like that rule? Then don't his it in the hazard.