Question of the Day!

The simple answer: Depends on how it's used.

A more complicated answer:
1. Depends how efficient the safeguards are that prevent it being misused;
2. Depends how efficient security personnel are at detecting, locating, and apprehending anyone attempting to misuse it (using AI, quantum computing, and nose-to-the-ground footwork);
3. Depends how efficient QC is at detecting glitches and patching them before they become catastrophes. (HINT: Don't let macrosux have the contract for patching the software.)
4. Don't allow juveniles uncontrolled access to the software
a. They don't understand what is crucial and what isn't;
b. old and wiser heads haven't trained them on what's "impossible" (which is why, among other things, the mortality rate of teenagers is so high);
c. as they get older, they may realize "that's impossible" is just the rallying cry of the narrow-minded moron, and try it anyway (and succeed).

The people in charge are politicians. Doesn't matter that cyberscientists are involved, unless their advice is listened to; politicians tend to be scientifically-illiterate by choice.

Gee. There doesn't seem to be a black & white answer, does there? Welcome to life.