Sinking Fishing Boats - Bad Form?

[Frank0001]

Personally, I wouldn't attack it. Fishing boats had nothing to do with the war. The men working on them were usually elderly, since the younger men would've already been drafted.
Surely the men would be patriotic, and report any U-boats when sighted. However, they fish for a living, not for the war.
And after all, the tonnage is usually too few to spend a torpedo on.

And, the Führer orders that no other than military targets be attacked. (That is, in the beginning of the war)