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He was advocating for the death of British servicemen.

Wasn't subtle either. Straight up "the only good X is a dead X" statement.

It sounds like celebrating, not advocating.

That's a very different thing.

It's not clear to me what you mean. Celebrating seems like a subset of advocating in most cases, including this one.

Advocating: X occurrence is good.

Celebrating: X occurrence happened, and that's good.