The graphic picture shows industrial cranes and hemp as being their preference for public execution, which only collaberates ideas of Iran being in a state of belligerence and hostility towards the West.
How does this follow, exactly?

A state of hostility and belligerence towards its own citizenry or those it defines as criminals, perhaps. However, I have yet to see the argument that the State of Texas is in a state of hostility towards, say, the European Union because it executes more than one inmate per day.