It's more the manner in which the bail was presented; the manner in which the judge decided what the bail should be tends to a presumption of guilt (the judge is ordering surrender of an item valued by the child in lieu of being put in jail); it's a little too 'eye-for-an-eye' for the bail hearing portion of the case. Monetary bail, to a degree, is different; money (while valuable) isn't necessarily an 'item', despite its physical form, and that standard for bail is consistent for any manner of criminal dispute (theft, assault, murder, extortion, and so on).