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Intrusions can take place from both authorized and unauthorized users. My personal experience shows that unhappy user can damage the system, especially if they have a shell access. Some users are little smart and removes history file (such as ~/.bash_history) but you can monitor all user executed commands.
This article shows how to log user activity using process accounting. It allows you to view every command executed by a user including CPU and memory time. You can easily find out which commands used to take down your system with these utilities.
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