[gorororog]

I'd guess that most people that responded "somewhat unacceptable" really wanted to say "somewhat acceptable" but without directly admitting that they semi support the act.

[CaptainFever]

Or, perhaps because people actually think that murdering people is not acceptable.

[gorororog]

Which in that case they would just answer "unacceptable".

"Somewhat unacceptable" is logically equivalent to saying "Somewhat acceptable".