It is true that in Wuthering Heights, after Hindley dies Heathcliff takes on the job of torturing those who are forced to live under his power.
Heathcliffe later made Hareton a servant as payback for his servant days that were put upon him by Hindley. Hindley had made him do the most humiliating jobs, day in and day out, so this was a suitable revenge.
He drove him from their company to the servants, deprived him of the instructions of the curate, and insisted that he should labour out of doors instead; compelling him to do so as hard as any other lad on the farm.(p.57)
‘Hindley does not often free us from his accursed presence,’ observed the boy. ‘I’ll not work any more to-day: I’ll stay with you.’(p.87)
Both Heathcliff and Hindley took it upon themselves to verbally abuse their female relations, first with Catherine, then with Cathy.
Hindley lavished on her a torrent of scornful abuse, and bade her get to her room immediately, or she shouldn’t cry..."(p.111)
Both Heathcliff and Hindley leave their sons on someone else's charge, knowing their sons' dispositions and how troublesome they were.
‘You are a boastful champion,’ replied Heathcliff; ‘but I don’t like you well enough to hurt him: you shall get the full benefit of the torment, as long as it lasts. It is not I who will make him hateful to you it is his own sweet spirit. He’s as bitter as gall at your desertion and its consequences: don’t expect thanks for this noble devotion. I heard him draw a pleasant picture to Zillah of what he would do if he were as strong as I: the inclination is there, and his very weakness(p.363)
Heathcliff cares about nobody and similar to when Cathy's ankle was hurt and Hindley left hr for naught, he left his son for nothing when he was dying. In that way, Heathcliff not aiding his sick son and Hindley's accidental throw of Hareton are the same in that they both harm their children, leaving them at the point of death.
‘’We know that!’ answered Heathcliff; ‘but his life is not worth a farthing, and I won’t spend a farthing on him.’(p.370)
And just like when Hindley suicides and all is peaceful for a while in Wuthering Heights, when Heathcliff dies suicides and the last oppressor is gone, all is resumed to its original peaceful state of a Heathcliff-less world.
He solicited the society of no one more. At dusk he went into his chamber. Through the whole night, and far into the morning, we heard him groaning and murmuring to himself.p(424)
His suicide and Hindley's were similar in the way that they let themselves' die, separating themselves from human contact and becoming increasingly distant.
Brontë, Emily. Wuthering Heights. New York: Scholastic, 1961. Print.