I'm pretty sure the vast majority of adult meat eaters have seen multiple videos and still continue to eat meat. Very few have actionable ability to directly stop the suffering so they then stop caring. One person cutting down on red meat will never be enough until there's enough lab grown meat and/or delicious FakeMeat alternatives to satiate western society at large. We still a long ways away from that.
Until then, vote for people who want to cut down on brutal industrial practices.