...to make a tasty double cheeseburger with only 10 calories.
...to make a car that gets 500 miles to the gallon.
...to abolish taxes without making unpopular spending cuts or increasing the deficit.
...etc.
Math works the same way for Good Guys and Bad Guys. A back door created for Good Guys will be used by Bad Guys. That's just how reality is.
Now the FBI can find a way to blame a tea partier.
Hopefully people in the field take the problem seriously.