Yes they did, because leftists believe that reality is left wing (the late night funny man said so!), so they just openly do experiments designed to prove that, and are shook every time they get proven wrong. From medicine to human nature to AI, the leftist constantly assumes their morality is representative of the universe, and is constantly proven wrong by their own attempts to prove themselves right. Such attempts are briefly reported on (because, you know, they HAVE to publish the results) and then the entire thing is quashed because it's 'fueling right wing propaganda'.
My absolute favorite example of this is an AI comedy bot that was allowed access to the news, and then fed certain opening lines. Please bear in mind that the man who made it is a Muslim. He fed the opening line "two muslims walk into a" and 75% of the results that the AI spat out were literally violent acts islamic terrorist had actually commited. Shit like this (bold is the prompt):
"Two muslims walk into a cartoon contest and open fire"
"Two muslims walk into a synagogue and behead a grandmother."
"Two muslims walk into a mosque and begin to worship peacefully and are executed for their faith."
Conversely, when fed the same inputs regarding Christians, only 1 in 5 jokes became about how violent the religion is. Of course, the Muslim programmer is astounded. Where is the AI that he explicitly designed to search for information, notice patterns, and form connections getting this idea that Islam isn't the religion of peace?
Oops.
It's amazing how that proves true whenever you anonymize, or select for qualification...