I think this is a good time to revisit this old age discussions because of the recent lore updates. For years certain posters claimed that the Alliance hated the Forsaken because of what happened to Garithos. We finally get an update about how the Alliance may view him.
Far from being empathetic, the Grand Marshal of what remained of Lordaeron’s forces treated the prince and his warriors with contempt and loathing, simply because they were quel’dorei. Finally, he sullied the name of the Alliance by forcing the blood elves to fight the Scourge on the most unforgiving front alone. His end was terrible, but better than he deserved. – Shaw
I believe there may be a little more sympathy toward the troops that followed Garithos, but their deaths may also be laid at the feet of Garithos. As Anduin goes on to blame the Alliance for their lack of understanding and acceptance of the Forsaken.
Per BtS, Anduin believes that the Alliance is at fault for their vicious relationship with the Forsaken. He talks about the Alliance turning them away, he talks about how the Alliance never tried to understand the Forsaken, prejudice and lack of acceptance is also talked about.
This is one of several viewpoints of Anduin:
But the Alliance turned away from them. All we had to offer them were names - deader, rotters.