And if some users do indeed disable it, what sort of code do you put it as an alternative to get the site to do what you want it to do?
As a rule of thumb, never trust anything to JavaScript except in the following cases:
1) You have control of the environment (intranet, sever side, admin functions, etc.),
2) Page, while missing behaviors, is still 100% functional (unneeded effects, redundant validation, etc.),
3) Behaviors are needed (if js is disabled user is out of luck),
4) You don't care (behaviors could be avoided, but you don't care).
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