WI has had Open Carry for a long time, most people don’t do it though and I now have a concealed carry permit. You are looking for trouble in most cases if you open carry, because the thugs see it as a chance to take it away.
Not really. The cases where an attack against an open carrier occurred because they were carrying openly are dwarfed by the cases where a concealed carrier were attacked because the criminal did not know they were armed.
The real danger that you face as an open carrier is government harrassment. You have to be prepared for that. Carry a recorder and be very polite to the police. Many open carriers have recieved settlements from lawsuits over deprevation of rights, but it is a danger that you have to be aware of and willing to deal with.
There has been maybe a couple of cases of open carriers having their firearm taken.
Most the the time the bad guys see as a chance of getting shot instead of a chance to get a weapon.
There are a lot safer ways of obtaining a firearm then attacking a armed person.