Earlier quoted context omitted.
One other difference - at least in terms of perception - is that the threats you listed are relatively static over time. Terrorism is a movement that involves recruitment and contains inherent plans to expand. To be the first to invoke Godwin's here, the Nazis did not statistically represent a significant daily threat to health and safety in 1928, either. Looking at present body counts as a gauge for what's worth "fr…
Exactly, terrorism is a high-variance event and we can't extrapolate that future violence will resemble current violence. A single catastrophic attack, like a nuke in a city, makes everything that happened before irrelevant. 9/11 itself was a huge escalation, the most deadly terrorist attack in history by far. Future death tolls are limited only by the capabilities of the terrorists and our ability to stop them. They…
This is rather sensationalist. There are infinite ways that anyone with a bit of intelligence could hurt or kill large numbers of people with small arms, explosives, chemicals, vehicles etc - and yet we see time and time again that terrorists usually display extreme incompetence (e.g. underpants bomber). The few terrorists that there are, just aren't very good at it.
The idea of terrorists getting hold of a nuke and actually being able to use it effectively is, frankly, ridiculous.