Not sure that's true, go to reddit for example, and you'll see the majority are already brainwashed into thinking Assange is a Russian asset. US mainstream media is working on it overtime.
Ask some random person on the street about Assange and the best they can come up with is probably something about fleeing from the Swedish police for rape, something Russian agent, maybe something about how he treats his cat horribly or doesn't clean his toilet properly.
The Five Eyed propaganda machine [0] was very effective in smearing him, and even Snowden, among the general public in these past years.
First they banned many communities and users who was right leaning or even moderate in the past two years.
Then you just have an echo chamber plus propaganda and bots are everywhere.
Finally, Reddit is the whole world, not the US. Many of the US specific boards were more right leaning and have been banned.
If that is your excuse to compromise on freedom of expression, than you don't support it in the first place. Just be honest with it then.
What you've done there is pure partisanship: defining "the other side" by the worst among them while ignoring the behavior of the worst among your own side.