Australia and the US should be labelled terrorists for their Middle Eastern "invasions", and pre-teen girls could "morally" be married off to adult men, according to reviled radical Islamic group Hizb ut-Tahrir.

The former claim was lobbed a day after the Sydney-based group's chief propagandist Uthman Badar was stopped from delivering a provoking sermon at an Opera House arts festival that asked whether honour killings were "morally justified".

In an attempt to deflect from the outrage caused by the sermon topic, set to be preached at the Festival of Dangerous Ideas event, group spokesman Mr Badar said any violence stemming from the Islamic community, such as honour killings, paled into insignificance in light of the atrocities orchestrated by the US and its allies.

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