I would tend to say no, on the same basis that I don’t support the death penalty; I don’t trust a considerably vast system to try all people justly, to make the right decision all the time. Why should I trust myself, who has far fewer checks as to what I believe? I’ve been wrong many times before.
Too, I would say that justice, in and of itself, is not always a laudable thing. After all, the whole idea predicates on the point that you yourself are able to escape from justice; it’s that point which makes the whole idea possible, as it were. “I wouldn’t if I had a life to lead, which they could take away from me; but if there’s no chance I will ever pay for my crime, sure, I will commit it.” It’s entirely hypocritical.
And, finally, it sets a bad example of vigilantiism. Not only do you have to be worried about your own ability to correctly indentify guilt, because inevitably other people in the same position will get the same idea, you have to trust that anyone likely to be a copycat has the same excellent judgement. Which is unlikely.