"Jacob Anthony Chansley, a.k.a. Jake Angeli, of Arizona, was charged with knowingly entering or remaining in any restricted building or grounds without lawful authority, and with violent entry and disorderly conduct on Capitol grounds ... " (
Source)
According to his attorney, Chansley is in jail because "... had been brainwashed by Mr Trump's propaganda ... " (
Source)
According to the judge, Chansley remains in jail because, "The Court is not persuaded that defendant’s mother will ensure his compliance with any conditions of release imposed, and defendant identifies no other custodian.” (
Source) From other news articles on the topic, I gather the judge formed that opinion after, while in jail, Chansley appeared on 60 Minutes without Court permission and there lied about his behavior at the Capitol on Jan 6.
It seems the judge does not trust Chansley to play by the rules and return for court proceedings if he is released. In this case, I'm inclined to agree with the judge. If the guy can't follow the rules while he is in jail, there is little reason to believe he'll follow the rules if he is released.