I'm aware that the present is informed by the past. 1953, like 1979, being a year in the past.
Discussing what terrorism is, in this context, is rather complicated. Especially speaking as a Brit, and knowing rather a lot of other dates, such as 1917.
It shouldn't be that complicated to acknowledge that Iran's proxies are about as cut and dry terrorists as they come.
It's surprising how many things that you would think are "cut and dried" are apparently in fact not "cut and dried", although granted it's much easier to identify instances that stray to one side of a boundary rather than another.
For example, the idea that bombing civilians is a war.