If there was a Trump pardon, I guarantee every major news outlet would bring up their Russian connections and Twitter would lose its mind. What people "seriously believes" changes rapidly.
I think lots of people think Assange has been (“is” is a murkier question) a Russian asset, but not so much a spy (someone who serves as an agent for collecting information) as an active influence agent.
For Snowden, I think that’s probably less common.
Simply put, Trump was threatened that if he pardons Assange, senate republicans (the establishment) would vote to convict.
I wish he had the courage to call their bluff, because them convicting Trump would fragment the GOP to an extent that is irreversible, IMO. Most people who aren't Trump supporters don't appreciate the extent to which Trump's base is not overlapping with the establishment GOP base.
"there was knowing and complicit behavior between the Trump campaign and Russians that stopped short of direct coordination, which may constitute conspiracy."[1]
1. https://en.wikipedia.org/wiki/Mueller_report#Redacted_report...
That's one of the reasons he colluded with a hostile foreign entity(Russia). Cause he doesn't give a shit. Sadly I don't have much hope for senate Republicans to do the right thing regardless of what Trump did, even after his role in the attempted coup
Trump doesn't have courage, he has bluster and self interest, he didn't see what was in it for him to pardon Assange
It's also been reported that Mitch McConnell threatened to support the impeachment if he pardons Assange. Though this claim has not been substantiated.