"....Obama's administration watched the alleged Trump-Russia collusion unfold in real time... and did absolutely nothing...."
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Probably because if the Obama Administration WAS involved, you would have a crime, and it would be like countries such as Russia, where the government directs the judiciary/police to pursue political enemies, as opposed to being independent.

But you knew that, didn't you?

Or is the fact the legal system works independently of the government of the day (in the United States) a surprise? 

What exactly are you implying? That Obama was directing the FBI to investigate Maniforte, or that Obama should have called the FBI off (neither of which, I believe can be done without serious constitutional consequences).

And again, The FBI has specifically indicated that Trump Tower was not "wiretapped", however if someone who was being investigated called someone in the Trump Tower, then yes they may have been taped....but then why would someone tied to Russia call????