It seems like many/most sites with content issues use a "flag bad stuff" option rather than an "endorse good stuff" option-- which makes sense if most stuff is

It seems like many/most sites with content issues use a "flag bad stuff" option rather than an "endorse good stuff" option-- which makes sense if most stuff is good. Why not give people with karma level of X (5000?) the ability to insta-kill anything that is rude? And perhaps people with lesser karma the ability to flag, where X flag points = comment death?