nijam,
But expiring criminal records is censorship! That's the whole bloody point. It's deliberate forgetfullness by society in order to give people a second chance. Which is why I think serious offences only expire if they occur while the perpetrator is still a minor - you get the chance to grow up and have a clean slate.
In the past printed records still existed, and you could search for them if you wanted to do so. But they weren't available to casual searching, or even anyone but the most determined employer or investigator. But you weren't allowed to re-publish that information.
Those laws were created in an era before the internet, and many of those records became instantly globally searchable. So the answer is that we try to patch the system to keep society working the way we intended it, or we change society to deal with the new realities. Google may squeal, but it's much easier to legally compel them to solve the problem, than to change social attitudes.
To give a lesser example, think of job recruitment. We're in a brief window of social change where the pepole doing the recruting are probably in their 30s and older - but often have access to the Facebook records of people who were teens when they had FB accounts. Hence there's a risk of a bit of sneaky research on potential employees getting them disqualified as a non-serious party-animals for stuff they got up to (and posted) when they were 17. And very drunk. Probably this problem goes away in 15 years, when the people in HR doing the recruiting have their own dodgy FB background to compare with those they're looking at. Whereas what people of my generation did when teenagers could only be recorded on film cameras, and if you were that drunk you probably didn't remember to process the film - in the unlikely event you'd taken a camera out with you.
So the question is, do we hope this is a minor problem and ignore it, or make a law that makes it illegal for HR to demand people's Facebook passwords?
Basically the intervention of new tech changes society in unexpected ways. But people tend to form their expectations of what's reasonable when quite young, and we're not all that good (or fast) at changing them. So sometimes you have to force society to change with laws, or you may have to use a legal sticking-plaster to give people a chance to catch up emotionally with what technology has suddenly made possible.