Arguments are valid or invalid on their own merits, regardless of the interests of the person making them. If Thiel made a claim that was false or that did not

Arguments are valid or invalid on their own merits, regardless of the interests of the person making them. If Thiel made a claim that was false or that did not logically follow from the premises, that would be worth pointing out. Merely suggesting that an argument is in someone's interest does not mean it's wrong. Are people only allowed to make arguments that are against their own interests? That seems unreasonable.