Th ex labour voters weren't all decent, some were/are ar$eholes who just voted labour before because it's all they know or they were duped to think some doctor form Turkey was going to join the EU and then come and steal their job. The good thing is there are are a lot more, a lot nicer people voting labour too, some voting labour with even less, people trying to just work their nuts off or in a bad situation beyond their control, they're nowhere near the same.
It's the same way I know some Tories that are alright, but they're just gullible, stupid or both. They just vote Tory as they think they've "made it" as they've gone from earning 20k a year to 30k a year, or got a 4 bed house in Ingleby on a 35 year mortgage. They have absolutely zero idea that the Tories are not looking out for them, they're 200 miles and 50k+ a year from the Tory radars.
People can vote in line with you, but have completely different ideas (or be *****), it depends whether their priority is themselves, others, their wallet, their area, their health, the collective good etc. The same way people can vote for something that can cause them, their family and their mates great harm, and they don't even know it.
There's loads that have recently appeared and gone down the Tory or Far Right rabbit hole since brexit came about, it's reared a real ugly head, and most people I speak to think it's basic closet xenophobia, which is in higher numbers than must expect or will admit.
Labour either need to get them back (if they want them back) or wait until they just die off or get bread out. Either way though they will eventually go though, as the rest of the world is becoming more and more integrated and diverse each year. We're one of the few going backwards. Hopefully Trump will get booted out, and the USA can go back to listening to experts again, then maybe we will follow.