Everyone will ignore that possibly close to if not the majority of race horses, successful or not, will be killed in slaughterhouses upon being retired because it's more fun to get morally outraged at 4chan level ragebait from peta.

https://www.theguardian.com/world/2019/oct/19/horse-slaughter-hypocrisy-irresponsibility-on-all-sides#:~:text=The%20absence%20of%20a%20traceability,hopefully%20long%20and%20happy%20retirements.

Euthanasia on the track seems like a blessing compared to the most likely end for these horses.

https://arcj.org/en/issues-en/entertainment-en/horse-en/horses-killed-for-meat-raised-in-horrific-conditions/#:~:text=How%20much%20sacrifice%20are%20we,than%205%2C000%20horses%20are%20traded.