Why would any thinking white vote dem? I can’t think of any good reason.
You answered your own question with one word: “thinking”.
Many white seniors living off pensions won by their unions think it is 1950 and that Harry Truman is still President. I'll take you to towns in Ohio where these geezers are the only ones who still have money in their pockets because their unions killed the town's industries. They will vote Democrat until they die, their widows will vote Democrat until they die, and their sketchily employed descendants will vote Democrat because they think that without government programs to support their lifestyles, they will die.