Reverse Polarity Fuses Circuit Question

Looking at the diagram, reverse polarity current won't get through the big D11 and D12 diodes, so the only thing that might carry it are the 3 wires that go off the bottom of the diagram, which I "assume" would fry before the fuses blew. Interesting. Makes me wonder if the reverse polarity protection isn't something Marketing added after Engineering was finished.

edit: Thanks to all for not dumping on me for having the diodes backward in my head in the text above. Salvo has the correct answer in the next post.