The only way to change the witnesses would be to change the stake-holders, which would mean someone has to put a LOT of money into Hive, to try to change things.
Anyone with the kind of funds to get stake like that, I would definitely recommend putting it into something besides Hive. Don't try to take a system designed for 1 thing (maintaining whale stake) and use it for something else... just build something else instead.
I support the idea of Free Speech, because it falls under the category of You can do whatever you want as long as you are not threatening, harming, or defrauding another.
A "fair & public trial" is definitely not something that I support. The whole idea of punitive justice exists only to serve the state, and those who control the state. In actual conflict resolution, things like a "trial" have no place.
There is a lot of stake that is not currently voting for any witnesses.