Kaddish for Gaza Slain

I’m sure you read about the controversy in England recently when a group of Jews got together to recite the kaddish for the 61 people killed in Gaza by the IDF during their “March of Return” protests, despite the fact that 50 of them are known to be Hamas operatives. The response of the “reciters” of the kaddish was that, although they might belong to Hamas, they’re still human beings and their deaths are still a tragedy and deserve a kaddish recited for them, and if it was Israelis who were slain then they would have said kaddish for them as well. Personally, I’m torn because I agree that any loss of human life is a tragedy, but the kaddish part somehow doesn’t sound right to me but I’m not sure why. Any thoughts?