I don't see an unbiased way to tell which "side" releases more disinformation and incitement to violence. Even deciding what counts as disinformation is hard (e.g. does it have to be literally false or just cause false beliefs in the reader?).
One way to tell would be to look at which side is incited to violence more often.
It turns out, according to the FBI (which is a conservative organization historically and exclusively run by conservatives), right wing extremism and violence is in fact the biggest domestic terror threat in the US, and it's currently growing [1]. FBI Director Wray gave this testimony after a right wing domestic terror attack was carried out that aimed to topple the US government. Not much has changed since then [2]. Since the former President's indictment the other day, the right-wing violent rhetoric has also ratcheted up a notch, so we can expect right-wing violence to follow.
Notably, we can confidently say this doesn't happen on the left, as when Hillary lost they did not launch an assault against the Capitol as the right did. Instead, they knit pink hats and had a march.
(PS before anyone whattabouts the George Floyd protests, the FBI doesn't see them the same way [3])
