Another Plugin that removes filters

I found this plugin and just want an expert opinion on it, especially in comparison with the Additional tags plugin.

Now Please correct my logic if I'm wrong:

This plugin removes the filters and allows javascript, etc. It lies in /plugins and I've activated it for my main site, which is the ONLY site at this point that I wish to remove the filters from.

Seeing as I can hide the plugin from my users, does this still present a security threat?