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In the same way that anything is a neo nazi platform. Facebook, twitter and instagram have their fair share of those too.

Turn on "showdead" and you'll find objectionable content here too.

Only if you also consider Reddit a neo-nazi platform

No, it was a platform for free speech and sharing images, which happened to include discussions between national socialists. It wasn't a "Neo-Nazi" platform any more than YouTube is.

"Elliot Rodger's Retribution" was posted on YouTube. How is this situation distinct from the Isla Vista one? E.g., why should YouTube not be blockaded, other than for reasons of corruption and nepotism?