I've been a frequent follower and contributor to the Balkans threads for over 5 years and I don't ever remember seeing anybody deny that crimes were committed by Serbs.
I'm a Serb and not only won't I deny that crimes were committed by Serbs, I'll even go so far as to say that there were a hell of a lot more men executed by Serb paramilitaries during the fall of Srebrenica than are shown is this little video clip.
Hmmm... it's been 10 years now. I wonder if we've crossed the threshold into "This is ancient history. The Muslims need to get over it already and move on." I sure as crap heard that garbage enough when it was in reference to the Serbs needing to "get over" crimes committed against them when it was 50 years.
As for the rest of your post, my thoughts on Srebrenica are these:
Nowhere near 7,000 were executed...most were killed in the running battles during the retreat to ABiH lines around Kladanj...at most, 2,000 were executed after being captured.
The Serbs were out for revenge for the attacks committed by Oric's Torbashi, in and around Srebrenica, where they used UN Safe Haven status to conduct raids into Serb villages.