My guess is that those who are going to be charged, have been charged.
In the end, charges against additional people could be facing several very high legal obstacles:
- Advocating or assisting in the hyper vigilance against trespassers is not illegal. Even focusing that vigilance on selected trespassers is not illegal.
- Advocating that trespassers in general, or even that selected trespassers be subject to citizen's arrest is not illegal. Assisting in that particular citizens arrest was illegal, but loudly advocating the concept is not.
- I think conspiracy charges need agreement to commit an illegal act and the conspirator must take a step to implement that illegal act. Thus, even advocating an illegal citizens arrest would probably not be an illegal unless the individual also took a step to participate in the arrest.
- Due to the deference given to the First Amendment, affirming the violent actions of another party- even in poor taste and using racist language is not usually criminal. For example, affirmations or justifications of criminal violence have been made by a variety of white nationalists, Nations of Islam activists etc. with prosecution being extremely rare.