Let's not forget the 8th, "cruel and unusual punishments [shall not be] inflicted."
Locking someone up to live in that violet world is indeed cruel and unusual punishment for most inmates.
It's simply not a perfect world my friend.
US prisons do tend to be cruel. Maybe there needs to be more gradation of prison, so prisoners are not exposed to any worse treatment than they gave the victim of their crime. But that's a bit outside the scope of this thread.
Inhumane treatment by other prisoners happens on remand (in jail) too. Bearing in mind that SOME accused are a danger to the community and must be held without bail, we could have 'smarter' jails. I think a step in this direction would be to eliminate county jails: to keep remand prisoners with similarly violent and dangerous prisoners, requires a large number to select from, ie a state jail system.
The eminent risk to the community isn't something I had considered when I started the thread. It does make sense though. One of the purposes of punishment is to reduce the chance of re-offending. Criminals who get caught are intrinsically irrational; they make bad life decisions. We count on lawful imprisonment (ie after conviction) to make them rational in their later decisions, and by and large that is true: recidivism rates are far above general offending rates, but they're still much less than 50% after long terms.
If the accused was arrested and charged for a lesser crime, and they have a good record, it is still necessary to have some bail conditions. Even if that's not putting up money as bond, it could be quite imposing on them. A teacher accused of child sexual assault for instance, would be banned from any contact with children (possibly including his/her own children). A bank employee accused of theft, would be banned from any position of financial trust. In either case, they'd be banned from their occupation until their trial was concluded, and unless they could prove some misconduct by the judge or prosecutor they would never recover their lost earnings. This is of course assuming they're found Not Guilty. They still come out behind.
Financial imposition is the least fair way imaginable, to prevent reoffense and require attendance at trial. It's even less fair than jail!
What I'm thinking now, is severely limiting the places a person on bail can go (eg, home, work, lawyer, doctor, one social haunt) and enforcing this using ankle bracelets. This would reduce temptation to re-offend, make it easy to arrest and charge them if they did, while also serving the main purpose of bail which is to prevent flight from justice.