The entire story is -Reimu tries to be good -Asshole Anon and Marisa are frame and blackmail Reimu -He beats her up -He brings something from her owner Rinse and repeat
This is actually a cute and insanely well behaved yukkuri too. She doesn't deserve this compared to all the stories filled with shit head Marisa's and Deibu's
I have to disagree. If we put them at the level of pets, as it is gold badged, there has to be some limit to the things that you can or can't do to them. Just because you own a dog it doesn't mean that you are free to abuse and torture it as you want, they have some animal rigths (at least in my country). Of course, if you put them at the level of food, you just can do them whatever you want, then there is only up to your sadistic you want to be (and the "research for better pets" sounds just like a poor excuse as this was an already superb mannered yukkuri that was put way beyond anyone's breakpoint, and even if one can justify the mindfucking, I'm still wondering what "research" puporse could have the final beating after everything is discovered. Testing her endurance to punching by an asshole owner?).
Badges don't really show anything except ownership and a level of training. From other works, it's used more as a sign of property and ownership. Which is why people don't harm yukkuris that are badged, because they're property of other people. By now it's pretty clear that there is no such things as animal rights for yukkuris.
Also research seems pretty valid to me, as we can see some of the other yukkuris he's bred, like the marisa that would jump into the water on command. The reason is because she's terrified of abuse, and it's all thanks to the Reimu.
The marisa was trained before the Reimu (she jumped in the water to trick Reimu as a excuse to start the beating, see 18 to 21), so it has little to do with the Reimu "training".
My point is, if you have an alrady almost-perfect yukkuri pet, that seems to have reached that level without the need to be terrified of abuse, why do you need to mindfuck and torture her? If the point is to test how long it can suffer in silence before telling the situation, why keep beating her? And of course the canon is that yukkuris have no animal rigths, I made the analogy to pets to show that using extreme violence to train pets is widely not accepted, so the thing is what kind of person uses the reasoning of "this is mine and I do what I want to it" and uses heavy psychological and torture to train pets?
Sorry, I have misunderstood "entitled", yes he has the legal right to do whatever he want to the yukkuri, as everybody has the right to do whatever they want to a yukkuri (as they dont have any rights) unless it is property of another person. I was thinking about if the things that he did to be morally right just because he is the owner.