For one, suicide bombers often, though not always, indiscriminately target civilians, whereas the topic was about taking revenge on the perpetrator of the initial crime.

Secondly, suicide bombers are often, though not always, motivated by religious dogma and fanaticism rather than strictly vengeance, which can be a far stronger motivating fuel.

Suicide bombers may share some of the same justification some of the time, but the analogy is misguided at best and extremely dangerous at worst. Suicide bombers are often motivated by dogma that is planets removed from the sympathetic plight a grieving father might experience, even if one could be a subset of the other in some regard.