Here's why:

* Magnetism and conductivity are different properties. While some materials exhibit both magnetism and conductivity, they are distinct phenomena.

* Magnetic materials can be classified into different categories:

* Ferromagnetic materials: These are strongly attracted to magnets and can be easily magnetized. Examples include iron, nickel, and cobalt. Many ferromagnetic materials are also good conductors of electricity.

* Paramagnetic materials: These are weakly attracted to magnets. Examples include aluminum and platinum. Some paramagnetic materials are good conductors.

* Diamagnetic materials: These are weakly repelled by magnets. Examples include water, copper, and gold. Diamagnetic materials are generally good conductors.

* There are magnetic materials that are insulators: Some materials, like ferrites (ceramic materials), are magnetic but don't conduct electricity well. These are called ferrimagnetic materials. They are used in various applications like antennas, transformers, and magnetic recording media.

In summary: While some magnetic materials are good conductors of electricity, it's not a universal rule. There are magnetic insulators, and the relationship between magnetism and conductivity can be complex and depends on the specific material.