Because what you really need is 60+ hacker-oriented color schemes from which to choose.
Base16 is a set of themes that can be shared across multiple tools, from VIM and Emacs to your command prompt or shell.
Preview all of the themes at the base16 theme site
This extension contains 60+ of the base16 themes. It provides VS Code wrappers for the TextMate version of the Base16 themes.
Other Base16 Themes: This may not be the VS Code Base16 port for you. If you want just one or two of the themes, you may want to just seach the marketplace for the one(s) you want. There is also another pack of base16 themes that appears to contain most of the themes. I didn't find that one until after creating this one, and am not sure of the details.
Yes, 60 can be a lot. As far as I know, the only way to disable a theme is to edit this theme's package.json and remove the themes you do not like. If you know of a better way, please let me know.