Using a computer involves taking physical and online risks.   

• because: fraud exists in cyberspace   
  • but: users can exercise good judgement   
    • but: good judgement requires technical knowledge that many users do not have   
    • but: professional criminals are very cunning   
      • because: man-in-the-middle spying is difficult to detect   
      • because: phishing is difficult for normal computer users to detect   
• because: hackers can steal personal information for their own use   
  • but: users can log off and close the browser window when they are done   
    • but: hackers can steal personal information during the users session, so logging off is not always effective   
  • but: setting up a firewall can enhance computer security   
• because: a virus attack can lead to data loss and hardware breakdown   
  • but: software can be installed to stave off virus attacks   
• because: the glare reflected off computer screens can cause eyestrain as well as headaches   
  • but: adjusting the position of the screen or the height of the chair can minimize it   
  • but: an anti-glare filter attached to the monitor can reduce the glare   
• because: too much mouse-clicking can lead to repetitive strain injuries   
  • but: users can take regular short breaks when they are working