If you are a total zen Buddhist then you are one with, and allowing of, everything. This person would not have a reason to enact their will on reality. To them, any and all reasons to curse, or do any spell work for that matter, could be considered petty.
So my point is, does pettiness even exist? Or can all things be considered petty?
For example, in another post someone(s) was/were commenting that the OP was being petty. That they have been ignored by their God/Diety/Spirit/ because their request was extra and petty.
Now I myself have chosen not do do spell work because I personally deem the situation petty. But that was my opinion based on my own perspective. Another person may think the exact same situation is, indeed, dire!
Who determines what is petty to “spirit”? And does spirit even care?
I would think not. Unnecessary, unjust, vengeful spells are cast all the time…and they are manifested!