Securing home Wi-Fi remains uncertain when it comes to law. Some urge users are not liable when they use default security settings and it is manufacturer who is guilty when/if wireless network was ‘successfully’ abused. Others put whole responsibility on users. This is practically a question to law and usually its resolution depends on lawyers’ skills to gather and manipulate the details. Your security encompasses not only security against the law when you happen to fall a victim to an intruder, but also protection against that very intruder. In the long run, it’s up to you whether to endeavor to prove your innocence or take measures to build a reliable fence.