Isn't the whole topic stupid? "All ravens are black" - "Here is purple one, freshly painted." You can rarely defend proposition that "All X are Y", because it

Isn't the whole topic stupid? "All ravens are black" - "Here is purple one, freshly painted." You can rarely defend proposition that "All X are Y", because it's usually pretty easy to forge X that barely passes and is not Y. Except for elementary particles maybe. Everything else is forgeable.