Lets define discard and deny. In simple layman's terms denying would be to say something is not there, and to discard would be to cast out, to say it is of no use as it were. Either way, the dzogchen teachings do not discard or deny karma. There is no where in the large corpus of dzogchen teachings (which you have failed to quote) that says that karma is not important and needs to be discarded. You have yet to back up your claim that dzogchen "discards" karma. To back this up, I request that you find something from actual dzogchen literature, not some modern talk or book. I showed quotes from Longchenpa that clearly shows the importance of observing karma and the pitfalls of "discarding" it. Your claim was that because of compassion dzogchen has teachings for those of lesser capabilities. Again false, because in dzogchen the view is the same throughout, only different methods are presented for different capabilities.
You claim to understand dzogchen and Longchenpa, but you haven't even begun to scratch the surface. And this is just in the realm of reading, even if you could read everything out there you still would be so far off from an authentic experience of dzogchen because you have no conection through a teacher. For someone who claims to be sympathetic to Longchenpa I am surprised that you are not even familiar with his works. You quote from one poorly-made translation of the Neluk Dzo, but there is so much more out there. The theg mchog dzod goes, which is regarded as the most complete presentation of dzogchen out there goes into much detail about our samsaric condition. I will find quotes soon. Also, Longchenpa himself said that his Yantik Yizhin Norbu is a work that embodies all his knowledge. In this work you will find practices mean to purify karma and teachings on karma. I would hardly call this "discarding" karma.
So your idea of what dzogchen is is like the blind man grasping at the elephant, grabbing his tail, and deducing that elephants must be small, narrow, and tail-like. Yes, there are many teachings of dzogchen that teach from the perspective of the primordial ground, where there is no karma. But just reading one of these works and thinking that you know dzogchen is foolish. The point is is that dzogchen is not and has never been presented that way. Its not like teachers just told there students "You are all primordially enlightened, just discard karma. Nothing to worry about." This is the problem with reading a book or two without the guidance of a teacher and thinking that you have it all figured out.
So I ask you again, please show something from an original source- meaning the dzogchen tantras or the Nyingtik literature that says that karma is to be "discarded." Please note that I made a distintion for you between discard and deny. And please reconcile this quote from Longchenpa.
Such foolish and arrogant people who do not know the various meanings of the Dharma say, "There is no karma and no effects of karma. In suchness there is nothing. It is like space," and they abandon virtuous deeds and indulge in evil deeds. Those are nihilists and not followers of the Dharma.
Longchenpa, Chapter 4 Shingta Chenpo
And please try your best to take your own advice and not get personal. You accuse others of attacking you while you are pointing fingers and judging. You feel empowered to judge other's progress on their own personal, spiritual path (which, I must say is pretty rude), but you should look at your own. You could use a little humility. You are basically saying that you know more about a path that you are not even involved in than others who have spent years with teachers. But that is besides the point, I will be interested to see some of these passages from the dzogchen tantras that say karma is to be "discarded."