"If families were detained, they would be held for short periods of time, perhaps just a few days, and their cases expedited through immigration court"
Not concentration camps. You don't get to leave a concentration camp after having your day in court. Are detention centers ideal? No. But neither is leaving people in the desert without food, water, or shelter, (or worse, leaving them prey to local vigilantes).
Yes, the Trump administration was keeping people in horrific conditions, forcibly sterilizing women, and separating children from their parents without cause and without tracking. If you have some specific evidence that those abuses continue to this day under the Biden administration, please feel free to share.