roflmao no ???
there are so many big citites in europe where oyu can walk in the night and nothing happens. brazil has a security problem becuase of lowlife dogs. we import them here in germany aswell. we had nice safe streets but it gets worse from day to day.
And most of those crimes (90% to be more precisely) are drug related. Nothing that a bunch of upper class nerds walking around the safest parts of the city need to worry about.
To all nerds here, I invite you to actually go to Brazil and have the time of your life.