I'm not sure if your question is rhetorical or not.
If it is there's no point in my going to the massive bother of laying out how the massive fraud happened in detail. I think you can see by reading BCsapper's post it doesn't matter how much evidence I lay out or how clearly I show what it indicates to some people. Their minds can't be changed. I'll just get snot, smears, lame attempts at what they think might be humor, peppered with out the butt claims from them.
I will show you some detail on what I believe happened though if you seriously want to discuss it.
I'd start by showing you that in spite of everything you describe the fix didn't just happen out of the blue. The coming election steal was seen by many in the months approaching it. The president warned of it. Media personalities not under control of the fixers saw it.
So, in spite of that, how were the oft spoken of but rarely specified "they" able to fix a presidential election under the noses of their leaders, the populace, the bureaucracy and administration?
Tell me your question isn't just rhetorical and I'll try to explain to you what I believe is the obvious answer based on the evidence.