"Need there be any other reason?"
What reasons, there are only questions.
Do you think Robert Hansson caused more or less damage?
Do you think Hansson should have recieved the piddling sentence he got?
I don't.
If you were arguing for an increase in his sentence I would agree with you but it seems you are saying that traitors should only recieve a decade or so behind bars for betraying and damaging their country.
The damage both these men did should not be rewarded with early release or compassion of any kind.