Why is an increase in the permeability of capillaries essential to the inflammatory response?

Question

Why is an increase in the permeability of capillaries essential to the inflammatory response?

Answer 1

allows the bodies defense mediators to travel from the bloodstream to the site of infection, to leak out of the capillaries; e.g. the macrophages, platelets, etc.

Answer 2

So that the leukocytes(first are neutrophils) and other proteins could enter the site of infection--a process known as diapedesis or emigration.