That is simply incorrect. The notion that violence against homosexuals should not be surprising is based on the fact that SOME PEOPLE will believe that it is deserving. Yes, such beliefs in THOSE PEOPLE are despicable, but you extend your ire to those who would simply acknowledge that these people exist!
We have seen police officers tried for killing minority citizens. The local mayor may warn the community that rioting and looting might ensue when the verdict is announced. If the officer is acquitted and rioting and looting do occur, do you believe that the mayor has endorsed it and he/she would cheer it as appropriate?  Your logic above suggests that you would find that mayor to be despicable!