Forty-one percent of Biden supporters say they believe people who support the Republican party and its ideologies have become “so extreme in what they want that it is acceptable to use violence to stop them from achieving their goals.” Likewise, 38 percent of Trump supporters say it is OK to use violence to stop Democrats from achieving their goals...
A significant share of respondents question if democracy is no longer a viable system of governance; 31 percent of Trump supporters said America should explore alternative forms of government to ensure stability and progress, compared to 24 percent of Biden supporters.
It is entirely possible that in their minds the statement
means that it's ok to stop the people who shoot up schools and synagogues etc
edit: as opposed to just bombing the Republic National Convention or swearing in ceremonies or whatever violence means to them here