One of the biggest misunderstandings existing about VPN use is that you only need one if you're up to no good. This is usually in reference to illegal downloading of movies and music, etc, and could also relate to a whole bunch of who-knows-what illegal stuff. They're also commonly used to get around legal blocks in your area of the world and by-passing geo-restrictions. But there are other reasons you might want one.
In essence, the VPN's job is to encrypt your data, and thereby providing security. So you might want to use one, even if you're not downloading a few seasons of Game of Thrones. Any time your data could be at risk, such as when you're accessing a public hotspot, is a good time to have a VPN.