Serving members of the armed forces should hold tehemselves aloof from political comment, but when the despicable attempt to make political capital out of their betters by assuming some sort of virtue by association, then they place themselves beyond the pale.
Well done L/Cpl B - we can learn from this that moral courage is as important (and rare) as physical. If GB had read his Kipling he would remember:
An' it's Tommy this, an' Tommy that, an' anything you please;
An' Tommy ain't a bloomin' fool -- you bet that Tommy sees!