Why is Norton DNS banning men's rights websites?

This came up a few years ago, and was allegedly being invenstigated by Norton. 

https://community.norton.com/en/forums/norton-dns-defaming-numerous-human-rights-sites-blocking-them-pretending-they-are-hateful

 

Anyhow, why is this UK gov link is flagged by Norton as "malicious website"? Other petitions on the same site are not. 

https://petition.parliament.uk/petitions/123299

Every feminist webiste I've seen isn't blocked, interestingly.

I did't realise that Norton is engaged in surreptitious internet censorship practises. Can someone please confirm if they are so I'll know to unsubscribe my Norton membership?