DB has been reorganized as an AG in the 90s, i.e. a corporation under private law. They are forced to (at least try to) make a profit for their shareholders, which is a common trait of private organizations. They consistently do so via short-sighted (mis-)management, another common trait with many private organizations. This privatized corporation is indeed fully owned by the state as its only shareholder, but unfortunately that doesn't manifest in the DB being run as the critical infrastructure that it is. I suspect that the indirections in power over the corporation that the privatized structure imposes is a key reason for why it became such a disaster.