I really don’t think it’s that, I think they realise that socialism is a fairy tale that doesn’t work. They also have a keenly developed sense of natinal pride, justice, right and wrong and retribution which is why deporting criminals and terrorists is always going to sit well with the majority. Give em half a chance and they’d be hanging remainers from lamposts too!
The Labour Party was offering democratic socialism, a system that is embraced by many other countries including Norway, Finland, Sweden, Denmark, Great Britain, Canada, the Netherlands, Spain, Ireland, Belgium, Switzerland, Australia, Japan, and New Zealand....countries who also believe in justice, the rule of law etc etc etc. This myth that they were offering communism, or something close to it, red in tooth and claw, is merely a myth peddled by the print media to people who don’t understand the difference.
I noticed you didn’t include tolerance in your list of British qualities....no wonder when we see the rise of racist attacks towards Chinese people simply because of the coronavirus and also the rise of attacks on Eastern European’s since the 2016 referendum.
As to deporting criminals...like the British nationals deported just yesterday ? BTW where did it say in Labour’s manifesto that they would not extradite terrorists to their countries of origin?