Why must the EU always stick it's nose in to everything even if only to try and fix what isn't broken.
Why are they doing this anyway? What is the point?
Or is it just because no one else gets an opt-out and they don't like it when things aren't all the same everywhere...
The opt-outs aren't worth much. You opt in or out of the EU. There's the other option of opting in and only doing what suits you. This takes politicians who will dig their heels in to fight their corner. If you have politicians who are highly enthusiastic about The Project, no matter what they say, you can forget that.
It's not just the EU either. Successive governments here have shown a willingness to concoct laws to ban this and that, which sound as if they are taking some problem of the day seriously, but which haven't been thought through and really do nothing much at all. In many cases, had the existing body of law been enforced properly, there would have been no need for new laws. I also think that the public and certainly the papers, rather like the idea that when something happens, like a spate of children attacked by dogs, there's a law banning whatever and that solves the problem with no further thought.
Then there has been the tendency of the Labour government to enact laws as a 'mark in the sand'. It seems to me that purpose of laws is to be clearly understood and obeyed and address a problem, not a potential problem or a non-problem, and not as a vague statement of how the government would like people to behave.
Then we have things like the health and safety culture which I suppose comes from the EU, but which has been taken up enthusiastically here. That something is potentially dangerous, whether or not it's an appreciable problem in reality, trumps all other considerations and leads to another clutter of regulations, which complicate and make things more expensive, but don't solve any problems. I'm thinking of part P of the Building regulations making it illegal for unqualified people to do domestic electrical installations. The annual number of deaths from fixed wiring had been a very low and fairly constant for many years. There just wasn't a problem.
Actually, it's a mistake to see the EU as a foreign power imposing itself. Our politicians have played a huge role in shaping it. They take up things which have come from the EU, but which they've pushed for, and embellish them. You don't have to look far for examples.
Lastly, I don't think you can blame the EU for being what it is, which is an state, or embryonic state, effectively controlled by bureaucrats with no proper democratic control. It is the intention to create a state, and what do you expect civil servants to do, left to themselves, but to concoct extra things to be administered? Bureaucrats doing things for bureaucrats with no reference to anything else.
I'd say the thinking of the EU was very much in line with the meddlesome nature and belief that government regulation can and should deal with every issue, that governments in this country have had increasingly for decades.