I didn't see this thread first time round. I think the OP was surprised and shocked not by the fact that the Nazi shit was on the internet, but by the fact that the relentless logic of the youtube / google systems had inexorably linked British patriotic music with Nazi propaganda.

The linking algorithms don't make value judgements, they just reflect what users listen to or view. They reflect the uncomfortable truth that there is a constituency of right wing degenerate filth that listen to 'land of hope & glory' and Nazi / fascist propaganda, seeing the two as complimentary and equivalent.

That truth can be shocking to behold