Why does bootstrap.sh copy the installation scripts to the home directory?

if I understood it corretly from README.MD, we can install like this:

```
$ git clone https://github.com/donnemartin/dev-setup.git && cd dev-setup
$ ./.dots bootstrap osxprep brew osx

```

and later when we need datastores, we run

```
$ cd ~/dev-setup
$ ./.dots datastores

```

I understand that `bootstrap` copies the dot files to the home directory, such as `.bash_profile` and `.exports`.
but why do you also copy the installation scripts, such as `.dots` and `datastores` to the home directory, if we are always going to execute them from `~/dev-setup/` (as they can be updated from git)?