As-salaamu `alaykum
Jazaak Allaahu khayran. I still yet need to listen to that khutbah...
Sister, firstly the Shaykh, may Allaah preserve him is known for his staunch stance towards imaging and photography, and in one fatwa of his, he even ruled out the use of video footage and gave his reasons... However, it would be best to try and contact the Shaykh to understand why he has declared the use of images for this purpose to be haraam, and it seems to me that he's coming from more than one angle, and not just the hukm of photography in of itself...
We know that these images can weaken the state of societies, it is probably this very reason why for example, in British broadcasting it is not permitted to display a image of a dead Brit, due to its effect on the morale and spirit of the people.
Also, they can easily arouse emotions. We have seen how the shi`a are moved by their emotions and call people to what happened in Karbala, and elsewhere. Using their emotions, they hope people sympathise with them. Likewise, the khawaarij of old and new tend to have this approach, so from the time of `Alee, how they complained about their slaughter at the hands of the companions in Nahrawaan, using that as a means of gaining followers. I don't see how showing the images of wounded Muslims is different.
Either way, I agree with the Shaykh on this and hate how people are so quick to spread these images, yet are lax with respect to other affairs of Islaam, including means of helping our tormented brothers and sisters.
Wa feeki baarak.