If someone with an ideological reason to hurt innocent citizens had driven the car in Liverpool a different set of laws would apply and the incident would be described as an attack rather than attempted murder.
Should we define terrorism by the scale of the danger someone wishes to inflict or purely by defined motive (religious hatred for example)? For example if someone triggers a nuclear device simply for the desire to murder without any underlying ideology that would not be terrorism but an attack by a knife if there is some evidence of ideological notice would be a terrorist attack.
I noticed on a work training course in vigilance for suspicious activity that perpetrators of potential mass harm were labelled as 'hostile ' rather than terrorists so is terrorism still a debatable term?