Why is golf considered a sport?

For example because in the top level when you actually sometimes have to do two rounds a day three days in a row without a caddy or a buggy (european team championship, etc.) in which case you walk more than 30 km a day under quite a lot of pressure....

Truth be told in case of one of those golfers who just sit in a buggy and hit a ball every now and then, its more of a free time activity

Whatever you think is the hardest sport, golf is twice as hard

Probably because it is a sport by every definition of the word.

Because there are enough other conditions in neurotic obsessions