This has nothing to do with "SJWs" or "political correctness", JonTron said that he believes that black people are inherently violent, that rich black people commit more crime that poor white people, and that we shouldn't allow "foreigners" to enter the gene pool. What Jon said shouldn't be defended by anyone, it is overtly racist and Playtonic is in the right to not want to be affiliated with that. The only "statement" being made by Playtonic is that they don't tolerate intolerance, but somehow people have gotten it in their head that not tolerating intolerance is intolerance, it's not. Jon is allowed to have his offensive and frankly incorrect beliefs, but he is not free from the ramifications of his words. Racist beliefs should not be normalized as "a different opinion" or "a different ideological view". This isn't a case of someone making an offensive joke, this is someone who said that they personally believe these racist things, things no rational person should be okay with defending.
If the people upset by this are sooo worried about tolerating other people's views I'd LOVE to see what they think of ISIS (or any other horrible groups or individuals throughout time), because by their logic we should just let them be.