there are tools for Mac OS X to select on which type of media the Mac should create this kind of folders (also the .DS_Store and others).

and as I said it is easy to solve if you empty out your bin.

the whole thing is similar to the windows Recycler folder which is present on every local disc and every disc that is mounted as a normal local disc.

so the answer is yes. Apple choose the way to keep the files and protect the user for accidental file lost, while Microsoft thinks that the user always know what he is doing and add some popups to remind him.

another tool that might help is Hazel, which can automate several tasks (such as sorting files or tagging them) but more important in this case is the function to limit the size of the trash to a specific size.
you could also use Hazel to automatically delete the .Trash folder from specific discs or to delete files from the trash who are older then some days.
Hazel is also able to overwrite files before it removes them from the trash. but I doesn't suggest this procedure on solid state discs (such as all the memories in the N900).