Filippo Vadi’s greatest concern seems to the preservation of the art. He feels that after a lifetime of mastering the warlike arts it would be negligent for him to allow the knowledge to perish. He reiterates this point later when he again talks about how he learned from many masters and wishes to ensure that knowledge is not lost.
Vadi’s work isn’t meant for the general population, which he feels lack the skill, wit, and agility to master the arts and would use them for vile purposes. Rather they are solely for the refined and law abiding men such as the courtiers, scholars, barons, princes, dukes, and kings. He repeats this sentiment again near the end, adding to the list soldiers and men-at-arms.
He then makes a point about cutting away anything that he feels is dubious and limited the work to only the things he has personally witnessed. This is repeated in the conclusion of introduction I quoted yesterday.
According to Vadi, the reason men have tools and weapons is that we were born with none. The lack of any natural weapons forced us to use our intellect to learn all tools and weapons. Any being learned and clever, a weak man of small stature can defeat one who is large, strong, and valiant.