What I see is a bunch of deleted comments to a question which has a high chance of getting strongly xenophobic but uninformative responses that violate Reddit's

What I see is a bunch of deleted comments to a question which has a high chance of getting strongly xenophobic but uninformative responses that violate Reddit's comment policy. We know that HN, Reddit, and a bunch of other sites have restrictions on what can be posted. Some people call this censorship. Others say it's part of the freedom of association - there's no reason why HN, etc. have to host all forms of expression. Without context - which this image link does not provide - why should we care? Why should I accept that this is 'censorship' in a form I should be concerned about?