Call it what you like, wrong opinion or not, killing him wasn't a travesty of justice in my eyes. It's that simple.
I think the point was due process.
We (the general public) have assumed/determined that Bin Laden is who the media have told us he was; did the things they told us he did. If those assumptions are correct, and for example he really was the head of a Al-Qweeeeduh and did plan/authorise the deaths of thousands of innocents, then you could say that justice was ultimately dispatched.
However due process is there to prove this; to prove those assumptions we have made beyond reasonable doubt. Did those terrorists responsible for 9/11 really have a link to Bin Laden? Etc. The intelligence communities say that they did. The intelligence communities also say that they cannot release the evidence into the public domain.
This is where you now have murky water. We have a service(s) that are killing people based on evidence they say they have, but cannot share. And these people cannot be publicly tried before being executed.
Uh oh. Now there's a problem. Anyone with critical thinking ability should have pause to stop and think about this. About safeguards to protect people from abuse of this extra-judicial killing.