I know.
I didn't think for one second that you were suggesting via your post that people shouldn't leave a means of contact. And I agree - contact details should be treated accordingly. But just as this country is full of idiots who think that they are so special that masks don't apply to them, I'll bet the shirt of my back that it's equally full of self-assessed special cases who don't need to leave their contact details - most likely because they either believe they'll never catch it or because they believe it's a big conspiracy and doesn't exist at all. There's no shortage of people who will use any excuse not to comply whilst putting others at risk.
I must admit that I'm struggling to see what useful information the police are going to gleen from contact tracing contact info collected by a pub. If that is a concern we should genuinely have then I think the issues facing the UK and UK policing in general are far greater than most people could have ever imagined.
Also, as I said in a previous post, I see no reason for anyone who feels concerned about giving out their home address to not just give their name and contact number only. Don't even have to give a real name. All that matters is that they have a phone number to contact people if they suspect that tbey may have potentially contracted coronavirus. Could a wayward pub employee abuse their privilege and call a females number asking for a date? Of course. Apparently it's already happened. I'm sure a female employee could do the same with the number of a male patron that's caught her eye. It's inappropriate and shouldn't happen and if it does it should be reported and there should be consequences. I don't see it as a massive issue tho. But as you hinted to, maybe I would feel differently if I was female. Unfortunately, I'll never know.
These are my feelings. I don't expect them to be shared by everyone and obviously my lack of concern doesn't negate the concern of others. Ultimately, I agree. Contact info should be treated sensitively.