Granted. But it's a special case with what some people consider a very important distinction - a conscious awareness is preserved instead of obliterated. Personal example:

In general, sharing my thoughts anywhere results in the local equivalent of downvoting. This has taught me two habits:

1. Constantly asking others whether my thoughts are appropriate (and various resulting meta-questions)

and

1. Constantly double-checking myself to see whether my thoughts are worth having.

Since, statistically, they AREN'T appropriate or worth having, it seems that my brain is simply a device for converting glucose into entropy. So why not shut it off and recycle it into something with actually useful output?

This argument can be extended to include many, many other people. Certainly, instinctive human morality generates a desire to preserve other human beings, but certainly not ALL of them. So why preserve the ones that aren't going to substantially improve the preserver's life?