According to the Article, why did the Stronghold Society build skateparks in Manderson and Pine Ridge?

The communities of Manderson and Pine Ridge required state-of-the-art parks to host the Apache Agency Skate Shop skateboard demonstrations.
Stronghold's mission is to inspire Lakota youth by providing opportunities within the arts and sports for creative expression, and skateboarding is one way to accomplish this goal.
Stronghold's primary focus is on the safety of kids in Manderson and Pine Ridge, and it feels that skateparks are the safest place for kids to practice and master difficult skating tricks.
The communities of Manderson and Pine Ridge have a high poverty rate, and Stronghold believes that teaching kids new skills, like skateboarding, will create more job opportunities.

The Stronghold Society built skateparks in Manderson and Pine Ridge to inspire Lakota youth by providing opportunities within the arts and sports for creative expression.