Why not just have faith that others will likewise flag it and it will get killed? Do you write a comment every time you upvote something to encourage others to

Why not just have faith that others will likewise flag it and it will get killed? Do you write a comment every time you upvote something to encourage others to follow your lead? I can see commenting as to why you voted a certain way if you have something insightful to point out like: "This is actually false, because blah blah", but otherwise, you just have to have faith that the rest of us are out here flagging things too. ;)