I'm sure it's common for people's stock investments not to totally reflect their moral values. You're just trying to make a buck, such things are regarded on a merely functionalistic level, and your measly 1200 or whatever shares will never made a large difference toward the activities of the company. In fact, they'll never make any difference at all, since your owning that stock doesn't give the company itself any new money. The only difference it could make is via your shareholder's voting rights, and that could only have only worked toward Locke's values, as it means more power for him to make the company do--or not do--what he wanted.

Or: Maybe early liberalism only cared about freedom for white people? Similarly to how I heard that Steven Pinker is a utilitarian who is anti-vegan and pro animal exploitation, presumably because he doesn't believe animal happiness and suffering count toward the overall level of collective good. Also similarly to how right in the constitution it said "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness," yet somehow that wasn't considered to apply to black people.