Ok, here is a different example not framing anyone for murder:
Someone believes that cryonics could not possibly work, and uses the dark arts to convince people already signed up not to go through with it, effectively killing them (though the persuader does not believe this, and in their expectations, have produced only good effects).
Yes, fabricating evidence of a murder is morally worse than almost any other type of lie.
Ok, here is a different example not framing anyone for murder:
Someone believes that cryonics could not possibly work, and uses the dark arts to convince people already signed up not to go through with it, effectively killing them (though the persuader does not believe this, and in their expectations, have produced only good effects).
Sadly, the scenario you describe is very realistic.