So, instead of killing the messenger, which you could define as me, Kilmeade, or Kirk
Do you believe in killing the homeless?

 I do.  I think there is a point in which human life should be expended for a greater good.  Greater Good, to me, is defined as an action where more human lives benefit from human lives lost.  

 Given everything is Nazi related these days, WW2 is a great example.  Scorched Earth burns were for the benefit of a Greater Good.  However in the US, I think multiple alternatives exist, and the killing of homeless should be reserved for those homeless that volunteer, or have of sound mind, denied alternatives to taking free care from a taxed system.  

 
And I have no idea how Kirk got into this debate

 Because Kirk's death was part of the overall discussion of mental health impacts on society.


And my post seems to have made quite stir
Are there people that think killing the homeless is actually reasonable?

 Yes, I think in certain circumstances killing humans is acceptable.  Homeless is not the defining factor for me, but it is a contributing factor.