You're upset there's not long threads every time someone gets murdered? Let's differentiate the circumstances between these two events.
Your link involves a murder of an old white woman by a black man who worked for a cable company. The motive was robbery; she wasn't hunted down because of her race. Obviously that doesn't make it okay, and it is a tragedy to this woman and any family and friends of hers and something that shouldn't happen to anybody. The article is short on all the details, but it appears he was identified and arrested within a couple of days and charged with capital murder. Not exactly 12 pages worth of discussion there, but nobody ever stopped you from making a thread that probably would have seen some views and a few "T&P's" posted.
Contrast that with this story. Now, we're talking about two white men who hunted down a guy who was simply jogging through a neighborhood when he was chased down in a vehicle and gunned down in murder. Possible flimsy motive that maybe he stopped and looked at a construction site, or there was a break-in in the neighborhood at some point with somebody who may have also been black. Actual motives seem to be racial. However, in this case it took over two months and this story becoming viral nationally before the men were arrested and charged. The original DA shrugged and looked away. That is worthy of discussion and why there is 12 pages on this. That is where the outrage comes from. If these men were arrested in February on site, there probably wouldn't be a thread.
I'm also guessing that if there was a thread about the poor old Las Colinas woman who was murdered in your link, there wouldn't be a handful of posters saying, "Maybe we shouldn't rush to judgment before we see all of the facts or the video. Maybe he had a reason to murder and rob the old white lady." Selective hypocrisy is a thing.
Hope this clears things up.