Dear A .Harris
There was a great deal of information relating to your research area freely available on youtube and other places for a very long time. Unfortunately the Overton window has shifted and a great deal of opinion that was considered reasonable in a free society is now considered to be offensive.
There is great difficulty in having any kind of balanced discussion in the UK and elsewhere about a great range of topics including historical events owing to the restrictive nature of recent legislation that has led to people self censoring out of fear of breaking the law.
As a Law graduate I am disappointed to see the law develop in this way as once apon a time "mens rea"or "guilty mind"had to accompany an illegal act in most cases in order to constitute an offence under the criminal law. At the present time the law relating to hate crime is encapsulated in this paragraph taken from The Metropolitan Police website:
"A hate incident is any incident which the victim, or anyone else, thinks is based on someone’s prejudice towards them because of their race, religion, sexual orientation, disability or because they are transgender."
This means that if you for example post a video of someone from a minority background, painting them in an unfavorable light, even though you do not in fact hate them (or even dislike them) if someone watches that material and forms an unfavorable opinion of this individual/race ect then the person posting the material may have committed an offence under uk legislation.
It makes no difference that the person/race/religion ect actually deserves the criticism because they have done bad things. The fact that what you say is the truth is no longer a defence in English law.
Hope this helps, all the best with your research