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The advantage is that the casual visitor sees less crap.  However, there are also downsides to this:<ol>

<li>It makes it hard to understand what the norms are.  This is especially important for the same casual visitor that becomes a first-time poster.  For example, if all the lazy homework questions are negative and therefore invisible, it's not obvious that lazy homework questions will be tarred and feathered.

<li>An exception would need to be made for your own posts.  Otherwise, your bad post simply disappears with no feedback and no way to fix it.

<li>We'll have a lot of confusion about posts disappearing in the night.  There will be endless meta questions <i>"I'm sure I commented on someone's homework question, but can't find it now"</i>.

<li>Bad posts won't get all the downvotes they deserve.  Once a post gets to -1, some people won't see it anymore, and therefore won't be able to vote on it anymore.

</ol>

We should leave things as they are except if we can reliably discern <i>casual visitor</i> from <i>user</i>.  Perhaps hiding negative posts is the initial default, which is then turned off as soon as the user engages with the site.  That could be via writing anything, voting, adding a reaction, signing up somehow, etc.