I am sure that the horses mouth in the third picture is bleeding. I will show this picture to my mare in the morning to make her realise how spoilt she is!
Apart from the dead sheep I think many polo players in the UK (and yes I have played polo) are just as rough if not more with their horses! I think that labelling other countries with the 'barbaric' title is not exclusive outside the UK! Think if they looked in on Amersham or on many other cases of cruelty in the UK? This is their culture and yes, I am sure there are collisions etc. but are there not in British polo?
We also eat sheep that have probably been transported for miles to slaughter. Theirs was probably killed on the spot.