The FAQ says that 10k+ users can view deleted posts.
Can they also choose to not see them at a given time?
We did change it a while ago so deleted answers always sort to the bottom of a question.
But in general we feel it is healthy for deleted answers (and deleted questions in certain circumstances) to get visibility in case they were deleted incorrectly or inappropriately or for the wrong reasons.
Specifically, I changed the line
// @match http://stackoverflow.com/*
// @match http://math.stackexchange.com/*
Then installed the script via Tampermonkey. Here's a screenshot of the result:
Clicking where it says "1 Deleted Answer" reveals the deleted answers.