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Members of this group were arrested and convicted in a plot to attack the inauguration ball using acid in the ventilation system and other alleged tactics.

Do you have a reference for that? Wikipedia has this:

After the January 14 meetings, James O'Keefe of Project Veritas posted a video shot at pizzeria Comet Ping Pong in the capital showing members of the DC Antifascist Coalition, a part of DisruptJ20, planning to disrupt the DeploraBall at the National Press Building on January 19—through use of stink bombs (of butyric acid) and activation of the building's sprinkler system.[11][12][13] DisruptJ20 countered that it had caught on to the Veritas operation and had thus fed its operative a false plot;[11][12] however, based on the video, the DC police arrested a man associated with the group[clarification needed] on January 19, 2017 for his alleged planning to disrupt the DeploraBall

Note that this was disruption to the DeploraBall (not the inauguration ball). It it true that the plan was acid in the ventilation system, but that acid was butyric acid. It's true that this would smell pretty bad, but it sounds a fair way from promot[ing] assault and anarchy against conservatives. One would also note that most conservatives would reject the implied association with the DeploraBall.