You might want to look into who Navalny was before he got famous in the West (and what kinds of things he said), and what grounds the various claims surrounding this stand on.
I'm fully aware of Navalny's history, all politicians are flawed in some ways, and Navalny is even moreso. Do you think that assassination is acceptable for that? The evidence for the poisonings is ironclad by any world measures except RT. Remember, this is about the Russian government's abhorrent "evil" behavior. Your whataboutism is a weak defense.