I am lost. What is with the user @Peanutswar?
Does it mean user @Peanutswar was a victim of similar case? Please clear.
He was a victim yes! He faced similar situation.
Keeping your account secure is your responsibility. Do you have
a declaration like this? If you have then it's @shasan's fault if he sent the money without verifying the message. But if you don't have such declaration then it's between you and @shasan. If @shasan is not convinced and ask for repay then you have to take the responsibility.
I am sure you don't have such announcement. I suggest you make one as soon as possible.
I just did post one here:
https://bitcointalk.org/index.php?topic=5481089.new#newCan you put it as a neutral tag to my profile? I'll lock that afterwards.