Bit of a stretch tbh... might as well blame it on colonialism etc... pretend they have no agency/control over their actions since then... nah tis all down to the evil west because they did something years ago, anything else that happened since then no one can take any blame for.
Hardly, we had a direct effect on the rise of the Islamic revolution in Iran with actions years prior, to pretend otherwise is farcical, this isn't ancient history either, some people are still alive from then.
Lack of understanding is why there are several hundred dead British soldiers and several thousands suffering, just thinking that Iran has no justification for **** is unhelpful, and leads us precisely nowhere in resolving it. It's a bit like like wondering why Germany went for a second world war since we gave them such a 'good' deal in Versailles.
That doesn't mean Iran should get away with continued aggression, we don't rightly have to put up with it, so we shouldn't, but that doesn't stop them having a valid agitation at the West even if it was a paternal sin. One can only hope Iranians can find a way to end their own torment without handing it to another demagogue, thankfully the likely person that would have been (Soleimani) is dead, so that's a bonus. The tit-for-tat does Iran no good, nor the does it do anything for the West either.