How does the short story "Uncle Ernest" by Allan Sillitoe illustrate the victimization his characters often face? How does it chronicle a too-ready acceptance of the larger society's interference and power?

The characters in "Uncle Ernest" exemplify the victimization of working-class people in a variety of ways. First, let's look at the two little girls who become Ernest's "friends." We first encounter them arguing over whether to spend the little money they have on cakes or a bus ticket home; one way or the other, they're damning themselves either to hunger or to a long, cold walk. They've skipped half a day of school to run an errand for their mother, who must work all day, only to labor cooking them dinner when she gets home. These girls and their family are victimized by society—they're in poverty and are hungry.
For Ernest, these girls are a savior: alone with his meager trade and drinking habit, with his survivor's guilt from the war, he feels directionless and lonely. He feels he has no purpose, until he begins providing Alma and Joan with meals and presents, which the girls soon learn to demand, because he will not refuse them:

He would never dream to question their demands, for to him, these two girls whom he looked upon almost as his own daughters were the only people he had to love.

The girls are soon taking advantage of his love for them, of the purpose he has finally gleaned from his slipshod life, victimizing him for their own gain.
And yet society does not feel sympathy for Ernest; they only see a grown man doting on two little girls and fill in the rest with base thoughts. All Ernest and the girls are doing is pulling each other out of their respective holes, but society must interfere. So the policemen, "smartly-dressed men" of a class above Ernest and the girls who have "powers" and are representatives of society in general, soon kick him out of the tavern and forbid him from seeing Joan and Alma again. He is misunderstood and victimized in this way by society, which propels him back to

a beautiful heavily baited trap of beer pots that would take him into the one and only best kind of oblivion.

So Ernest had the only thing giving him meaning forcibly taken away from him, and the girls had their only avenue away from hunger and poverty taken away from them, both by a society that is quick to exercise power and slow to try to understand the situations of its individual members. Because of this, the drunkenness of Ernest and the hunger of the children are reestablished at the end of the story, perpetuating an "order" in society where those in power exercise their control over the wellbeing of the poor—in this case, in the name of protecting the innocent.