Does someone with such an interpretation have cause to mutilate the painting, though? Why not make a different painting (or some other art) conveying that sentiment, instead?
Emotionally, I can identify with people who feel that those who have proudly sown human misery do not deserve to rest in golden frames.
[edit] As OP mentioned, many have shown the other side of war; Grosz, Dix, Goya (https://www.theguardian.com/artanddesign/gallery/2014/may/14...)
I can emotionally identify with people who think that sowers of human misery are bad, but not with people who think art should be destroyed for what it depicts.
I can understand when someone refuses to address butchery with a polite and artful response.