You need to stop with this absurd argument. Anyone who has a job, has ever used a computer lab, or registered for a social media site are warned about copyright violations. Ignorance is no excuse.
And this crap about being consistent - I am 100% consistent. If I see a violation, it is deleted. If I receive a complaint from a content creator, the post is deleted.
There is between 600 to several thousand posts a day here alone. This is not a job for me, nor for any other mod. I see maybe 10% of daily posts.
Ultimately each user owns their own posts. Any user wanting to know what may be allowed should google "fair use doctrine."
Here is one link:
My rule of thumb is 10% of content, or one paragraph, whichever is less.
This, as always, is not open for debate.