Computer users have both rights and responsibilities. Just as a person accepts responsibility when they drive a car, they must do the same when they operate a computer on the internet. They must take reasonable precautions to prevent their computer from being compromised.
Part of the reason that users should be responsible for protecting themselves is to prevent attackers from using their computer as a platform to attack others. By users not being careful and using the internet without knowing the steps to safely do it, the performance and useability of the internet is compromised for all users. There are many examples of how internet performance has been degraded due to excessive virus or malware infections.
All computer users should be trained to understand the basics of computer use to protect both themselves and others. They should know the threats that attachments in email can pose. They should also know when someone is trying to trick them into going to a malicious website.