Maskil, having a sensitivity to not hunting doesn’t mean he had “jewish values,” it just as easily can comport with secular humanism. Or worse, that aninals are just as important as people.
Does he say that it’s wrong because Hashem has mercy on the animals? Because the gemara says that that’s a mistake, to say yagiu rachamecha on aninals by shiluach haken. Rather it is for OUR sake, to not build in ourselves the midah of cruelty.
Did Einstein say any of that? If not, it’s not a “jewish value”