All the marks on the Reimu were already there in the other picture. So there wasn't any physical torture. It may just be realizing that fucking Marisa gained it nothing and getting rid of the kids before moving on to another pet yukkuri.
Not like Reimu getting abused a bit would change anything, after all, it's long accepted that breeding without permission and with a random partner instead of letting the owner tell you if that partner is acceptable or not, is punishable and clearly a bad gold badged pet attitude.
Though that reimu seems to be brocken, her eyes kinda give it away...
Yeah but she's broken Coker, remember this, Anger inducing is usually the overall feeling that pic a gives, not a single aspect of the pic that make you particarly angry.
So while you find the baby eating anger worthy, the overall pic is kinda, well, satisfying if you think it's a fitting consequence for their uncaring actions without the consideration of the Marisa's owner.
Your point is valid. Though i don't think he should throw them out. That will just lead to trouble down the line. he should just crush them and be done with it. I feel slightly sorry for the marisa she's probably just trying to follow her natural instinct to be a parent. (So she should have asked her owner to help with the problem instead of going out by her self.)
I actually agree with you on this, but, probably this Mister wasn't into killing yukkuris and treated them the same way real people treat unrespectful or troublesome pets when they can't solve the problem, throw them out or put them to be adopted somewhere.
Of course there is also the funny option which is any of Remyaki "breeding pets" comics scenarios, but making sure that you have control of everything, from where is the food to anything they could break or body slam down, should be in places only you can reach for the sake of making sure you don't get any unnecessary collateral damage.