Mussolini (and many others) thought the war all but won by Germany - hence the quote you post. From that starting point, with his political views and territorial aspirations, declaring war was an easy decision.
When you say “at this day and age” I think you mean with the largely pro-facist Italian mindset of 1940? So ignoring hindsight and my own morality?
Please clarify RJL.
Thanks
PP