Lisa at Frog Pond has surely dealt with her share of crazy loons. I am not on Facebook much these days, so don't follow closely; but, I am a fan of Lisa & Frog Pond. I'd assume that if the right way to geld Ollie was at the vet's facility that that is how it was done.
Disclaimer: Just a beginner who knows nothing about nothing
What rescues have the facilities to handle a stallion? Very few that I know of. They usually get gelded because many rescues 1) don't support breeding and 2) are largely staffed by volunteers, who may or may not be able to handle a stud.
And I say the latter despite having known nothing but very sweet, perfectly sane studs. It still limited their turn out options and where they could be kept. A rescue is, by nature, worried about finding good homes for the horses they have and not breed conservation. Be angry that he fell into a rescue's hand to begin with, for goodness sake. He has foals on the ground SOMEWHERE, the genes are out there.
Draft stallions are often more difficult to manage -just due to size. We have had two Percheron stallions and have been around probably hundreds of draft stallions at shows-they are not for a rescue type facility. Gelding is completely appropriate for that situation, even if there was risk. People safety should ALWAYS come first!
But having been to Portugal, i do know that not all countries geld. Portugal does not geld their Lusitano stallions. They only work the stallions (or at least 90% of the horses ridden are stallions, 10% mares). They use temperament as a huge criteria in who to breed. Using temperament as a criteria for breeding, sure can produce some amazing stallions. Stallions that are used for group lesson horses, for children, etc. So different than other stallions I have met. It is one of the reasons, I love the breed so much.
So, I can completely understand why not gelding is done also and why some might be against it...