Hungary and Slovakia, the only European countries that haven't allowed illegal immigration in, are at the bottom of that chart, while Sweden is getting rekt... Legal immigration is of course fine and necessary, as long as the state and socials systems can assimilate it... (Japan is a good example). But articles like this show concerning data points in western countries with uncontrolled migratory policies.
Looking at [1], murder rate in Slovakia is comparable, and Hungary only slightly lower. Sweden isn't even near the top murder rate in the EU, and a number of other countries which accepted a large number of refugees have lower murder rates than Sweden.
[1]: https://en.wikipedia.org/wiki/List_of_countries_by_intention...