How did the "Bleeding Kansas" incident change the face of antislavery advocacy?

Bleeding Kansas was a mini civil war that happened between pro and anti-slavery groups in Kansas from 1856 to 1865. This was mainly caused b the Kansas-Nebraska Act of 1854 because it gave freedom for the people to chose if they wanted to remain a slavery state or not.

The use of violence by pro-slavery groups changed the face of antislavery advocacy, because since then, many radical abolitionists, such as John Brown, defended that slavery should be extinguished by any means necessary including open violence.