To build a few campsites? That isn’t going to change this threads problem. The demand on these lottery and reservation sites is many times the current availability.

Costs of initial construction are low, cost of maintaining logistics in remote areas is high. Ex:Removing human shit from backcountry campgrounds is done by mule train and helicopter. As you add sites, you have to add support staff, hiring people is expensive.

These challenges are complicated further by peoples lack of respect for the lands they are camping and sightseeing on. Pack in pack it out/ LNT, is an honor system. The NPS can’t keep people from falling in boiling water and trying to hug 1000lb wild animals for internet points. Getting these same people to pick up their used toilet paper is a real struggle. And in case you were wondering, yes, your used TP goes in your bear canister with your food trash to protect wildlife (personally I double bay my shit paper, but is not a glamorous part of the wild).

A fed bear is a dead bear.