These are not mutually exclusive ideas. In fact, they're complimentary if you turn your head and squint a bit; the Four Freedoms are targeted at minimizing the creation of a classist world where some people control software and others merely run it. Avoidance of a classist world is a "social justice" concept.

The Black Hat Conference this year pulled a talk given by Crown Sterling because it was, in the opinion of the people in attendance and security researchers, absolute psuedoscientific trash.

https://www.vice.com/en_us/article/8xw9kp/black-hat-talk-abo...

Don't let anyone convince you hackers are anti-deplatforming. They merely disagree on what behaviors or speech are worthy of having a platform.