The spell would erase major parts of a pony’s memory. Due to the fact that this could easily get abused, it was considered black magic. Like all black magic spells, this one, too, was off limits for most unicorns. But now, there was no other option anymore but to cast it. Celestia carefully studied it in order to control it perfectly. She had mixed feelings about her plan to use it. On one hoof, she knew it was the right thing to do, since it would help her subjects. On the other hoof, she felt bad for manipulating them against their will.
damned if you do damned if you don't the worst possible thing to a ruler
Late night theory:
A: Reapers do not consume flesh = they become weaker
B: Reapers consume more de manis = they become more like the de manis
So, A + B + 10 years = ...Uh oh!
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Red reaper incoming.
And then, Malice was born!!!
damned if you do damned if you don't the worst possible thing to a ruler