Not at all! Perfect question…
As an aside, as I’ve stated here on this forum in the past, I too have had people misunderstand my intentions with questions I’ve posed. So I completely understand 
To clarify - it’s not just my belief. This is a relatively universal concept and is called in witchcraft (in various forms) The Law of ThreeFold Return and most believe in it.
It’s even in the Wiccan Rede itself - ‘An it hurts none, do as thou wilt’. The ThreeFold Return works with good and bad magic.
Many here have mentioned the same belief as it is backed by science and most religions. Christianity, Judaism, Hinduism, etc, even LaVey Satanism, mention versions of ‘What comes around goes around’, ‘Do Unto Others,’ and Karma - meaning ‘You do it to someone else it gets done to you’. Scientifically, for example, underground explosions will reverberate and return to the source much louder or stronger than the original. This is literally how one can find the source. Another example is the infamous ‘Butterfly Effect’.
So, let’s say the Universal Lord ALLOWS someone else’s baneful magic to effect you, in that case now the baneful magic AND whatever effect it had on you returns to the sender THREEFOLD.
That’s the meaning behind, ‘Be careful what you wish for’ & ‘Those who live by the sword…’ This belief is pervasive in every culture simply because it’s true.
And there’s no counter spell to stop that ThreeFold Return because the original was done with intent and knowledge aforethought.
One person said this and it stuck with me, but I don’t know the original source, “Sometimes the Universe uses us to reveal other people”. I personally have found this to be true.
Blessings 