I recomend not to use these JS library because these library will take some brandwidth of your website. Most of the code these JS library is useless or un useful to your website. Still you are adding these JS library to your website.
DjamesAllen the plugin has not been updated for over 2 years and I don't think it is even compatible with the latest version of WordPress.
DjamesAllen Yes we have a plugin, however too much plugin is not a good idea for the safety of our websites WordPress. Your safety is not measured in the quantity of plugins but their quality.
Also a plugin is native integration: Use the plugin, see if it works. If more people need this, it may get added.
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I'm just tired of seeing the same old error page on WordPress sites ;D. Some people try to use the some third party JS library like Mootools, Jquery, lightbox, Prototype and etc… I recomend not to use these JS library because these library will take some brandwidth of your website.
You've got a plugin for this problem. His name is comment validation.