Where on earth have I ever tried to claim stadiums weren't an issue?
You have made it quite clear that you think the blame for this can be attributed (criminally) to Duckenfield. And you have only accepted the other factors when pushed on the matter in this thread.
In reality such distater are regularly the result of a sequence of bad decisions and or unfortunate chance events.
Hence why it is often so difficult to criminally prosecute individual parties because it is only cumulatively that their decisions result in the problem.
Let's say I hand you a (not to your full knowledge) defective product it goes wrong and kills some people and then you are up for prosecution. And I start coming out with a list of things that you could have done that might have averted the particular distater that occurred (but might not have averted an alternate disaster in of themselves.)
I'm not at all surprised that a jury, presented with the scenario on the day, decided they could not be sure that Duckenfield was guilty and so did the only thing they are allowed to do.
Duckenfield' actions after the crush are a separate matter and if the CPS thought there was the evidence to support it they would have charged him with with perverting the course of justice as they did with Donald Denton and Alan Foster or alternatively misconduct in a public office.