The generational curses have to do with the imprints in your DNA.
Exposures to environmental hazards (disease, toxic elements) as well as learned behavior can affect your genetic make-up.
Here's an excerpt that attempts to explain.
Images raced through my mind. Faces of the broken and helpless. A mother with horror in her wide eyes as she watched her child being torn apart in front of her by a neighbors killer dog. The images of war and lost, crying children stumbling around as the bodies of their parents lay in the yard. Sometimes I grieved so deeply for all that I had seen that I could neither eat nor sleep.
“Tragic.” He said.
“So where were the angels when they could have intervened to stop these things? Or to give comfort?” I asked.
“Mankind was not ready for our help. Life and death had to take its course. Many tragedies could have been prevented if people had taken personal responsibility more seriously.”
“That’s a rather cold response.” I said.
“Only because you do not look deeper to understand. Alter-humans still exhibit reactions based on emotional programming rather than using intellect and logic to correct the suffering in their world. For example, the vicious dog. When those dogs have been bred and trained for fighting and killing, it activates the modification of certain genetic codes. These changes become an inherited liability from one generation to the next. The scriptures tell you this, too. You have read of the generational curses.”
“Ah, yes. The sins of the father. ‘He punishes the children for the sins of the father to the third and forth generation.’ I always thought that was rather unfair.”
“Fairness has nothing to do with it. It’s all genetics. Now, if the offspring of this aggressively enhanced dog were to be mated to a gentler kind, and so on into the next generation as well, eventually the genomic imprinting would become recessed and the temperament would come back into balance.”
“And if it’s bred with other dogs of aggressive training…?”
“It’s human stupidity if done with that purpose. But some alter humans have been bred the same way and it becomes their nature to keep and train blood thirsty animals. It’s a transference of their own aggressiveness. It becomes a kill or be killed world. It’s past the point of achieving balance.”
“But aggression is a natural instinct for self defense and survival.”
“Yes, but alter humans, were specifically bred just like the aggressive dog in your story. They were genetically engineered to enhance adrenal output and they are more aggressive than what is natural in the rest of the galaxy. This DNA change has caused a corruption in normal human personality and limited the alts ability to know their innate connection to creation. From time to time, we have continued to select individuals for the introduction of extra gene pool additions and some progress has been made.”
“You mean the alien abduction stories are true?” All this time I had thought those stories were simply made up for entertainment. I had never given it a thought as to having any real merit. It was National Enquirer-type ridiculous fantasy in my opinion.
He smiled slightly. “Sometimes you alter humans are very amusing. The sad part of all this is that, although, as I said, we had some progress, the overwhelming result was that the intelligence gained by the alts was used to refine the aggressiveness. Alt man raised himself above mere verbal or physical contact aggressiveness and developed incredible applications of weaponry.”
“Why have you come back to the earth at this time?” I asked.
“Mankind on this planet is on the verge of annihilation. There is nothing but war and toxic poisoning left. The earth and its people are corrupt. The DNA is becoming beyond repair and alt humans are advancing into grotesque mutations. And the weaponry that has been developed now threatens the entire galaxy.”