You may have skipping reading all the details. Some of which include that local law enforcement may become involved at any point. This can be requested by the accuser, the conference staff - or even the accused should evidence be in dispute.
The actions of conference staff are a route for dispute resolution for things that may not warrant law enforcement involvement, and if law enforcement should be involved, it will be and will obviously supersede any decisions by staff. More importantly however, is that law enforcement involvement is painful, potentially ruinous, and does not take into account the actual conference nor its other attendees.
Hypothetical: corroborated harassment incident; law enforcement is called in at the request of the accused/accuser. Action is taken. This does not remove the harasser from the site, nor does it trigger further sanctions against him or her within the community or conference unless such a set of explicit rules is codified.