I think there are a great many prominent counterexamples of bail being denied for people who pretty clearly fit that bill. Chelsea Manning comes to mind, being neither a flight risk nor potential re-offender.
Chelsea Manning didn't go though the federal court system.
As an enlisted member of the military, she went though a court-martial under Uniform Code of Military Justice, which are a different set of laws that don't even have the concept of bail. So different rules apply.
But still, they do have roughly equivalent rules around pretrial restraint and needing to prove that confinement is actually necessary (especially since the military can eliminate flight risk by simply confining them to base). Even at the time there was much (justified) criticism that her treatment was a "degrading and inhumane pretrial punishment"
Civil contempt of court is handled under yet another set of laws. And those laws don't appear to have the same presumption of bail that the laws dealing with criminal pre-trial detention.
Which kind of makes sense, it's not the same thing; Criminal trials have bail because it might take months or years of delays for the prosecution and defence to build a case. Here, the court has ordered you directly to jail as a punishment for not following their order; You can leave at any time by complying with the court order.
https://www.theguardian.com/us-news/2019/apr/22/chelsea-mann...