The Labour party was founded by unions, so it's no surprise they're still completely beholden to them.
https://en.wikipedia.org/wiki/History_of_the_Labour_Party_(U...
https://en.wikipedia.org/wiki/History_of_the_Labour_Party_(U...
They are therefore naturally detached from unions, and more worryingly, the every day reality of the electorate.
For some of these MPs, losing their seat at a General Election is the first time in their entire lives they've ever lost a job, unlike the general public that have to put up with routine dismissals, via redundancy, company bankruptcy and so on.