To the OP: I will assume that you will be able to pull off a "widow maker" cord safely.
The problem is that most people out there wouldn't/couldn't be able to pull this off. Most electricians/linemen know this. I know I wouldn't be able to, not because of me, but because there is a chance that even though I'd have a safe setup in case of a disaster, a curious neighbor kid might wander by and pull the cord. Even a gated backyard may not help.
I'd say it is a gamble, most likely the OP will "win", but if Murphy has his way, the consequences can be severe. At the worst, the local press would have a feeding frenzy on the subject, which would essentially force the DA to throw the book at the offender in order to keep his or her job.