Aries determines his own destiny. It's his life and he's in charge.
Collections of human creatures frequently run into difficulties when trying to govern themselves as a unit.
Pluto in Capricorn represents society's conglomerates with their elaborate sets of rules made by all types of people. Over time the flaws, weaknesses, and naturally decaying elements of these complex organizations come to the surface. Some rules become antiquated, some become impotent and useless, and some get increasingly annoying.
When Uranus teams up with independent Aries, rebellion takes place, and in a sense, Uranus in Aries is rebellion against one's own self.
A bunch of individually rebelling selves squaring off against a company of entrenched firms and stiffs can definitely create a ruckus.
I figure those who want to conglomerate should go ahead.
An autonomist, as I am, continues on his way with and without others, inside of logical parameters, of course.
Government of, by, and for the self.