The point about cycling accidents claiming more lives than terrorism is simple a fact and entirely relevant to the study.
I'm not convinced it is a simple fact.
The higher than expected number of casualties is attributed to a change in peoples' behaviour. What caused that change? Whilst it may have been a number of factors, the article and the research paper both attribute the change to terrorism. Whether the casualties are a primary or secondary effect of the initial terrorist act, we still need to consider the root cause.
I'm not convinced it is a simple fact.
The higher than expected number of casualties is attributed to a change in peoples' behaviour. What caused that change? Whilst it may have been a number of factors, the article and the research paper both attribute the change to terrorism. Whether the casualties are a primary or secondary effect of the initial terrorist act, we still need to consider the root cause.