Still, when we say that a person does something good, we imply a certain degree of altruism in this action, or at least a motive and calculation in sympathy and further good relations (which is naive IRL, but we are now discussing a character). When Seymour "helps" someone, he always does so out of calculation. When he "helps" Lena, he does so out of lust, perhaps, as the latest chapters show, out of a desire to leave a legacy, as well as a desire to control a beautiful potential starlett. Moreover, from a conversation with Arthur and Seymour's own admission, we know that Lena is far from the first model with whom he has signed an exclusive contract. And he ended things with them because they couldn't "stir his emotions." That is, most likely, they rejected him. This is hinted at by the fact that if Lena mostly refuses to satisfy his fantasies, he will hint at the consequences of breaking the contract. Why would he terminate the contract if, according to him, his goal is to foster talent?
When he "helps" Ian, he does so at least with the intention of benefiting from a best-selling author he has moulded with his own hands, who is completely under his and his publishing house's control. But I don't think that's the end of his motive, especially considering that he always points out Ian's connection to Lena. Let's see what his offer will be after winning the competition, especially when he rigs it and makes Ian the winner in advance in case of cooperation with Lena. Oh, and he's ready to take control of Lena when he knows she and Ian are dating.
We don't know the details of his agreement with Axel, but I don't think it ends with mentoring in photography, especially considering that Axel would very much like Lena to sign a contract with Seymour.
In addition, he profits from gentrification and, in the event of a confrontation with Lena, tries to squeeze Van Dyke out of business. It is also unclear why he wants to meet with Emma. Moreover, if he is her father, as you say, he is also pursuing an incestuous relationship with his daughter. And he wants to install a mayor who will allow him to have complete, unlimited power in the city.
I don't like Victor's temper, but he is honest and wants to give real talent a chance to be heard. Unlike Seymour, who promotes commercial fluff for teenagers, pushing real talent aside. For example, with high Wit, Ian says that Saturn Comes Back Around has little chance of being published by Hierofant because it will be too complex for most of the audience. Victor, on the other hand, would have no problem publishing such a book in his publishing house. And yes, everything in the game indicates that Victor is a talented writer, contrary to your claims, and has a keen eye for talent in others.