Inefficient spending by democratically-elected bodies is still better than inefficient spending by corporations. Do you really want to live in a society that only receives public works when a corporation decides it's good for business?
There's this fantasy that corporations are somehow much more efficient than government, and I haven't found that to be the case. The major difference is that corporate spending isn't transparent to the public, so it's subject to decreased criticism.
> San francisco spent 2 bill on a bus station alone.
I assume you're referring to Salesforces Transit Center[1]. "Bus station" is a misleading way to describe it. It's huge (~235,000 sqft), includes a large public park, and will connect to high-speed rail.
There are public benefits to having a large transit station with green space in a central urban location.
1. https://en.wikipedia.org/wiki/Transbay_Transit_Center