Example of how the media can harmfully influence the population.
This is an important topic and people on the Left can go too far extreme with cancel culture. The underlying notion is to look deeper than the surface to the causes of violence and cultural imbalances, but there are a couple of problems with approaching it with cancel culture. Firstly, sometimes reading into things results in false assumptions because it relies on inferences, intuition, and assumptions about symbolic communication being interpreted the same way by everyone. You cannot establish high truth values with these inferences, although as an artist myself, I process a lot of information in this manner, but have to be disciplined to sort out speculative knowledge from facts. You analyze a range of symbolic interpretations and not a codified set of correlations.
This boycotting of entertainment to control the baser human motivations goes back thousands of years. Even Thomas Aquinas has an essay about music creating too intense a sensual/sensory experience. The pipe organ was originally banned from churches because of its associations with Rome. Jazz was boycotted for stirring up the base sexual passions, etc. The Beatles were boycotted, records burning was a big thing in the 70's. I grew up having the Religious Right be responsible for most cancel culture from Jerry Falwell outing Tinky Winky to boycotting Ellen Degenerus, of course multiple Marilyn Manson concerts. There was lots of hype about homosexuality and also Satanism. If either notion was read into a performer, they were boycotted.
Evangelicals perfected cancel culture. Now it’s coming for them.
Now I do see that it is on the Left. It is a mistake even in cases where entertainment could negatively effect culture. I think creativity and art tends to be more of an expression of existing culture, and creating certain feedback loops, but it doesn't determine behavior to the degree that cancel culture hypes.
The example in your video is a good one. The reality is that for every individual that watches "The Joker" you are going to have a somewhat unique interpretation of it. Shunning entertainers and creative works is dysfunctional and creates more sensation, actually. The example of the college professor speaking out against the movie could be turned into a healthy dynamic if she wanted to devote a class session to discussing it from different viewpoints, so that students could consider all the different ways a person could think about the movie.
I don't think canceling, deleting, removing creative works is the way to "fix" a culture. I think open discussions is the correct path. If there is a historical movie that is racist, it is more important for people to see it and discuss it. Hiding it is another form of revisionist history. It is like saying "this movie was never made". I think we need to admit it was created and talk about why society thought it was okay to portray certain demographics as such. Same is true for current works. If there are moral issues, talk about it. Let people say stupid things. Let them say insightful new ideas. Hear different viewpoints, so that we have more understanding about people and culture and not less understanding.
Edit: This is the generalized position, and there could be specific instances where I could agree with some censorship, if there wasn't a way to pair it with discussion. I would say some historical movies could be aired with an adjacently aired discussion. Child libraries require a little different consideration for developmental reasons. There are not absolutes in my mind about complex social dynamics.