If I were setting up an automated abuse-report-receiving system that could automatically disable accounts, I would run some sort of filter for "is the account reporting the abuse itself a newly created account, and/or one with suspiciously low and non-human looking usage patterns?".
But on the other side, malicious actors can solve that problem by having clickfarm workers in bangladesh create 30 fake facebook accounts, post random drivel on them for a week to make them look like they're in use, and then use those to report abuse.