Does it? The violence and riot that people are seeing as being insensitive and tone-deaf to vocalize concern for aren't certain who's actually causing said violence, and their unspoken assumption is that it's the black communities themselves, hence we need to "listen" to them. So no, it doesn't matter if the individual(s) who killed this man is/are black or white because it's being painted with the same broad brush of "let's just listen."
I'd argue that framing this guy's murderer as "just some opportunistic ***" would be very generous, if not insensitive, dismissive, and insulting.
And what of what's being perceived as being condemned in these threads has condemned that?
Again see above. What's actually being condemned? If someone's conflating those, who's doing it? Either people have condemned the things you're suggesting they shouldn't (or at least that you propose their may be more nuance available for) or people are interpreting certain condemnations as blanket condemnation on different actions.
BabyPeterzz had offered similar thoughts, stating that he was seeing too much finger pointing and judgment. I tried to ask for clarification if he saw finger pointing and judgment of protest. He would answer that question, and that's his prerogative, but if people are seeing others speaking against unprovoked violence and destruction and assume that they're condemning protestors, then the conflation of senseless violence with protest belongs to them, and it may be something worth self-examination for what it may highlight about their beliefs regarding these black communities.