Password Protection for Single Entries has a serious flaw!

The
"Password Protection for Single Entries" as it is in the "Library" (so automatically included in the software if we make a field in our database called "Password") has a very serious flaw:

OK, to modify the data of individual entries just the person can modify who knows that individual password.

But anybody can delete any other people's data too, because the system does not asks for the password in this case!

How can be this solved? To be possible to delete only for those who know the password (and of course the database owner), so they don't mess with other people's data?