I think in a large, extremely powerful country as the US is, with the biggest military industrial complex on the planet, big pharma, big media, multiple intelligence agencies etc.. power and influence throughout the world, that yes there is a deepstate to co-ordinate things/policy in the direction they want to go. And they never liked donald trump, he's an outsider who hasn't climbed the party ranks, passed through their vetting processes, hasn't shown his loyalty to govt but in fact challenges some of their past decisions etc..
You're asking me to provide proof against that context, the proof is not going to be provided by the various depts and agencies of govt, or the msm media, as even if they could detect and find it, they want donald gone as much as democrat voters. That is my theory, my thoughts, I cannot objectively prove them.
Atm it doesn't look like there is much donald can do about it, the results will most likely stand, but until and unless all the main allegations are addressed and explained away properly, in a way that people will understand and believe/trust, then millions of republicans at least, will still feel the election result was taken from them.
With brexit, no one on the remain side claimed the vote was rigged, or was the result of miscounting, because imo it aligned with their perception/experience that there were a lot of people, enough, who didn't like the EU for the result to be accurate; but in the opposite way people struggle to see how Joe could win so many votes cleanly, they could see obama's public popularity in 2008, but joe's must be the most hidden in all political history.
Trump looked far more popular, perhaps that was only on the surface, but add in the other anomalies like the congress votes, increase in ethnic vote for trump, and counties won etc...the sum of the equation looks askew, but the public are largely being asked to take it on trust. [there will be no audits or investigations, recounts yes, but would they be capable of uncovering any co-ordinated voter fraud]
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On the earlier stuff, specifically regarding posting lies and misinformation, I had something written before the above, but it disappeared and I can't recall enough to do a rewrite, so I'll leave it.