I realize it is tempting to jump on the "judge is a moron" bandwagon, but in the US of A, the judge makes decisions based on what the prosecutor and defense attorney tell them. They can't ask questions of the defendant. It is the prosecutor's responsibility to bring it up at hearing what the defendant's prior behavior is to mitigate being held without bond. If the prosecutor doesn't do his/her homework and know about the defendant's prior record, stuff like this is going to continue to happen. And since the prosecutor only asked for $25,000, I'll bet they didn't do their homework.
There's plenty of blame to go around on this on as in many others. If the prosecutor didn't know the history he should have. If he knew and didn't tell the judge he should really be hammered. We don't know who knew what or what was presented. The person who made the final decision, the judge of course, is ultimately responsible. If you think that it's the job of a judge to maintain his ignorance in these matters I guess you'll excuse him. So far he seems to be living up to your expectations.