@funkyDexter. Yes, asking "Are you creating a virus?" is a perfectly normal question but it depends when do you actually say it. If the user has mentioned in detail what he or she is trying to do and you know FOR SURE that it will be used maliciously then yes it is perfectly normal to ask. But if a user has just given a hint which may or may not have anything to do with a malicious code then the user will not take that question in the right manner. I won't. So it is better to probe the user politely and then once you are sure, go ahead and comment.

Also if you feel that the user displays a "pattern of dodginess", instead of being harsh, report and downvote the post. I am sure the mods will take care of that. Being "Harsh" will only promote more complications