Helping Firaxis to fix them. They have fixed stuff reported here in the past (nearly each of the last updates contained something I reported here, like the bug with rockbands performing on defunctional districts or AI trading logic changes) - though not everything. They said they prefer reports on the 2k forum and I adjusted a few days ago. I'm now reporting each bug there, too...but only very brief and with a link to the forum here (reason: 2k forum doesn't easily allow uploading screenshots and saves). And the threads here have also another use: They allow other players to confirm reports, narrow down issues or detect false reports.