Do you feel that a person who died in 1982 has any influence over the company today?

The only reason the company exists today is because of the crimes of the Quandt family.

Would you be surprised if some people swear off buying BMWs for that reason?

There's no practical way to live in the modern world without indirectly benefiting from forced labor. Some of the cobalt required for EV batteries is mined by forced labor in the Congo, and there was a recent controversy around BMW and VW importing vehicles to the USA with parts made from forced labor of Uyghur prisoners in China. Even in the US, virtually all license plates are created by prisoners who earn 8-16 cents an hour.

My original point was to the "Elon schadenfreude" crowd cheering for BMW and swearing off Tesla because they don't agree with the founder's actions. Seems like selective outrage to me.

This can be seen in data. Compare the car sales of Netherlands vs Denmark, two countries next to each other with similar living conditions, one of them occupied during the war, the other not. Guess which one of them don't have any German cars in the top sales list. Even today. Though I don't believe todays generation would hold a grudge, now it's likely more brand loyalty momentum that sticks.

Both Denmark and the Netherlands were under German occupation during WW2 (and only one month apart since April/May 1940)

One advantage is that he's dead and (thus) does not push his extremist views to the public.