I've never respected peoples opinions of 'Oh riding horses is terribly cruel'!
Fact number 1: Horses don't know any better... You can't want what you don't know.
Fact number 2: Horses weigh a TONNE and could pummel us if they felt like it. I mean, we could be living in fear, because every time we try to mount a horse it rears, kicks, bites, barges etc.
Fact number 3: Look at the horses ears while you are riding... They are generally swiveling around, listening, or pricked forward. Hardly ever flat back. If they are flat back it usually means they are in pain, or maybe they saw another horse they don't like... Or on rare occasions, they don't like being ridden.
Continuing on from what I just said, this documentary simply took one side of the story: The horses who don't like being ridden. I can tell you, there aren't many of them....Horses like to have a purpose :)
So they simply took some of those horses, filmed them being ridden and said 'Look, it doesn't like it, so that means every horse in the world hates being ridden, no exceptions'.