Because that's the way it works and there is probably another strong reason
The best government is that which governs least. No human depositories can, with safety, be trusted with the power of legislation upon the general interests of society so as to operate directly or indirectly on the industry and property of the community.
Hm, are you sure you got the question right? Because all of the sentences are written in active voice! Active voice is essentially everything that is not in the passive voice, and I don't see any passive voice here.
Passive voice would be formed with subject+form of "to be" + past participle,
and we have no example of this. All of the sentences here are in active voice.
