content: Let's assume the opposite. Your contact list includes the name of a hacker, who then connects to your network and conducts a brute attack against your router from within your private network. Your router's security falls and the hacker immediately rootkits it with backdoors and spyware. All of your communications are now being forwarded to a malicious third party without your knowledge. Incoming data may be tampered with in order to introduce malware and rootkits that will infect your computer. Any device connected to your private network is vulnerable so long as it remains connected. Your own router becomes an unavoidable man in the middle that's under the remote control of hackers. I think that's even worse because you assume you can trust your own networking hardware.