CEP Strategic Advisor Liam Duffy writes: While the official counter-terror lexicon of most states labels such outbursts as ‘Islamist terrorism’, what authorities usually mean by that is the jihadist violence of the likes of Al-Qaeda and Islamic State (IS). Among the steady trickle of stabbings or vehicle-ramming attacks, there are indeed those either claimed by IS – such as the 2024 Solingen mass stabbings – or those attributed to IS by the perpetrator, such as the vehicle ramming in New Orleans which ushered in the New Year. There are also those where the mental health of the attacker does indeed seem the most pertinent factor.