Gentlemen prefer WEP

Question: Why a gentleman would use WEP on his WiFi router at home?

Answer: Sometimes even a decent man is tempted by weak (or lack of) security of the host somewhere on the Internet. His moves, that he is about to take, may cause some counter-actions in the form of police, trial and jail. He may use TOR and avoid all this misunderstanding, but what if he is careless. He uses WEP, remember?

Here comes plausible deniability. Here is the quote from wiki, 'cause I can't say it better:

Plausible deniability is the ability for persons (typically senior officials in a formal or informal chain of command) to deny knowledge of or responsibility for any damnable actions committed by others (usually subordinates in an organizational hierarchy) because of a lack of evidence that can confirm their participation, even if they were personally involved in or at least willfully ignorant of the actions. In the case that illegal or otherwise disreputable and unpopular activities become public, high-ranking officials may deny any awareness of such act in order to insulate themselves and shift blame onto the agents who carried out the acts, confident that their doubters will be unable to prove otherwise.

So WEP might not give a gentleman an anonymity like TOR, but a "portion" of immunity.

Can we call this gentleman careless now?