One who carries openly is probably less likely to be confronted by a criminal than one who carries concealed, because many potential attackers will decide that it's silly to attack when they know they'll encounter armed resistance, when they could simply wait and attack (hopefully) unarmed people after the armed people leave. The person who carries openly may well be at a disadvantage if a criminal decides to attack anyway, but the odds of that occurring may be slight compared with the odds of deterring the attack.
Either course of action could be right or wrong, depending upon the situation.
What is wrong with guns in schools?
Works in Israel, Utah and parts of Texas.
This guy made his little part of America safer by being armed.
I will go you one further: Occasionally (but not always), ANY course of action could be right, wrong, or indifferent, depending on the situation, or not. Maybe. The results may be unpredictable, or entirely predictable. Or somewhere in between. Usually.