Some articles on laxism:

Catholic Probabilism - Status of The Question - Arguments Against Probabilism
... by some Catholic authorities as an easy road to Laxism, because people are often inclined to regard opinions as really probable which are based on flimsy arguments, and because it ... to reject the opinion which opens the way to Laxism ... employed, and that no serious danger of Laxism arises if it is recognized that an opinion is not solidly probable unless there are arguments in its favour which are sufficient ...