They are a demonstarted threat that Iran is willing/happy to call for terrorism around the world, and that their threat is real and will be carried out.
That the Islamic Republic of Iran's words such as 'conduct terror attacks in the UK right now' and 'death to America' have the actual threat of death behind them and aren't just 'rhetoric' as HN claims.
One that HN won't care about, but that Iran targets and kills jews, not just Israeli jews, but all jews, anywhere in the world, as their political agenda.
