Invariably, the IRA’s aim was to induce terror by fear, not by actual death. Hence the “coded warnings” etc. It was more about terrorising by fear in many cases. Yes, there were myriad deaths and killings, but for the most part, the motivation was to scare the crap out of the “opposition”. I grew up checking the car for bombs before any journey, etc. One could say that the tactic of fear worked, up to a point. Never stopped me, or my family, from carrying on our normal life, however.
Equally, the IRA would not want to be seen to do it. Being photographed would shatter the illusion of terror.
There is a new genre of terrorist, driven by getting themselves in the media, focussed on generating online terror. Far more scary, far more deadly. Far harder to deal with.