If the complaints turn out to be unwarranted then obviously not! In other instances potentially yes, if and when it could be shown beyond a reasonable doubt that bank executives were trying to con customers to their disadvantage, that they did this deliberately, repeatedly and with malice and deceit, that the consequences for victims were sufficiently grave, etc. etc. The lawyers cited in the Irish Times article argue that this can and should be done under existing legislation, but not being a lawyer myself I can't assess their claims. Another question is whether legislation should be changed to make bringing criminal charges easier where the conditions just mentioned are met. I think there's a prima facie "sense of justice" argument in favour of considering this, esp. given Ireland's traditionally quite lenient treatment of white collar transgressions compared to its fairly harsh approach to some categories of working class crime.