frontpaw Squatting is not theft. That's not me saying that, it's the law. For something to be theft you must have the intention of permanently depriving someone of their property.
If you changed that to make squatting theft you'd end up with horrible problems. For instance, how would you deal with a tenant who withheld their rent or a landlord who kept a tenant's service charge?
You can permanently deprive someone of their property through squatting. You have to exclude them for a period of time - nine years or possibly 12. To claim squatter's rights you also have to exclude all others in that time. After that period of time you get a limited title which will become a full title after about 20 years. If you want to sell before you get full title the buyer may be advised by their solicitor to pull out or at least negotiate a hefty discount.
It's quite difficult to do that but not impossible. There are instances of councils losing houses to tenants through forgetfulness but they're very rare and it makes you wonder whether a local authority is a fit body to be managing valuable public assets if their officers are as stupid as that.
I read the case you describe to. It was an Eastern European family who were renting from a criminal gang. I can't remember the full details but I believe they moved on in a matter of days before the police arrived.
They did steal and cause damage which is horrible but no different to burglars breaking in and taking a shit on your carpet, which is something I've experienced.
The squatters who moved in while the woman was at the shops left immediately they realised the house was in occupation and caused no damage apart from to the locks or windows. They were members of one of the many squatters' groups that pass around information on empty properties and how to stay within the law. They printed the wrong address.
Again, I'm not excusing that or diminishing her distress but the fact that those two stories made the papers shows that squatting in primary homes is unusual.
btw I'm not a lawyer. It's best to check with an expert first. I do know about how newspapers and politicians go about whipping up public fury out of things that aren't a big deal on closer inspection.