Is this your general view on all ships carrying fertiliser? Do you know how many people would starve to death if we stopped shipping fertiliser around the world?
I'm no starving expert, but is all fertiliser explosive?
A lot of the useful ones are nitrate based. So, “sometimes”.
Only ships owned by countries we are more or less at war with and have a rich history of sabotage and assassinations. I think this is fairly self-evident.