For once I agree...
But by storing a rifle in Ruth's garage anyway, and without telling or asking her, he did in fact potentially jeopardise the convenient arrangement of his wife and daughters living with Ruth. That's why the narrative doesn't make any sense.
Sure, if Ruth went through his stuff she may have found the rifle but I reckon that Oswald counted on the religious Ruth not going through his belongings and history shows that in fact she didn't.
Over the years I've had people stay with me and I respected their privacy, is that unusual?
JohnM