If you follow the thread to post #115 there is another user name who says they agree with what the post said. Possibly another FED trying to get others to post the same thing.
As for another poster agreeing with them. That reminds me of the kidnap Gretchen plot. If a person is not careful you can be in a room full of people where everybody seems to agree something bad needs to happen, and you find out 2/3 of them were feds….. At your trial.
Looking more closely, the post #115 was to a different post after #105 that suggested violence. The poster at #115 may not have seen, or may not have connected the later post to #105. I have no reason to believe the poster in #115 was agreeing with the violence post.