The main problem with Zorotards, Sanjitards, Amidraltards, Yonkotards ecc is simply: they really can't read.
And, furthermore, they have Alzheimer.
Ryo is a man who, for his mission, hasn't scruples.
We already knew that, from Wano arc:
He isn't like Kuzan, Garp or Sengoku.
He's more...