Ensuring the accused turns up to court is only one of the concerns to be considered in deciding whether to grant bail. In some cases it is the primary concern, but in many others* it is not. Which I'm sure you know!Bail is about ensuring attendance at court.
My only purpose in referring to bail is because it shows there can be rather drastic and harsh consequences of being charged, despite the presumption of innocence. Which you acknowledge. Which tends to undercut your argument!
*I've no doubt you are well aware of this, but for anyone else interested - aside from risk a person won't come to court, other risks a court has to consider when determining bail are: protection of victims and the community; risk of committing further serious offences; and risk of interfering with witnesses or evidence. Not to mention that you can't even make a bail application nowadays if you're charged with a show cause offence, without first satisfying the court that your detention would be unjustified!