Yes, this is true tigerfish. But don't forget two things.
1) Job had not sinned, yet the devil was permitted to afflict him.
2) The devil will always be the thief, killer and destroyer. So if he has legal ground he always enters. But even if he has no legal grounds, he always tries to trespass. That's the nature of a thief.
I say this, not really in adressing you, but because I have seen far too many times when a person suffers illness or tragedy, there are always those around looking to see which sin in the person's life they can blame it on. Not always!!
Ultimately, Romans 8:28 will alway prevail when we watch how God works things out. :-)