How did the actions of John Brown deepen the conflict over slavery in the US?

Most Americans were against violence with regards to the slavery issue in antebellum America. This was doubled when a US arsenal like the one at Harper's Ferry was used by John Brown and his men, including some of his sons, to try to incite slaves to revolt. Brown's actions made many abolitionists look far to radical in the eyes of law abiding citizens. In the case of other radical abolitionists, Brown's actions were not applauded but were respected. Unfortunate Brown was already known as a killer in Kansas. This fact hurt the anti-slavery movement. Few people who did support Brown, divided the anti-slavery movement as well.