The permissions are set like this for security purposes on servers and production machines. If you are just using a personal desktop or laptop that's not hosting anything to the outside world, then it probably doesn't matter.
If you feel like diddling with the permissions, then you can always try a chmod -R 666 on the log directory, although I'm not sure if this will break anything when it comes to the log writers needing specific permissions on the files, or if the permissions will not change when the logging software decides to change the logs. However, I still think the best way to view the files is with a
sudo less filename
It's only one little extra sudo.