system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do squatters in the UK have rights to where they are squatting? Why can't they be kicked out as soon as they are discovered?
gpt
Although the specific laws and development differ in different places, the ultimate reason is always that the people who have to enforce an eviction don't know in advance who is actually right. 

Even if it may seem obvious in a news report, if someone is living at a place and some third party comes in and says "that's not there house!" presumptively believing that second person can create a lot of problems. Generally, society thinks it's better to let the tenant/squatter stay in place while the court system sorts out the truth, rather than acting hastily. 

It also incentivizes landowners to monitor their property (and prevent squatters) rather than pushing all the costs to the police.

Of course, this can lead to weird outcomes, but the same thing could happen the other way.