In Star Wars, the lightsaber was the weapon of choice. The lightsaber could cut through everything in sight and deflect bullets. Lightsabers are an innovation to the sword which is just metal. The lightsaber can also do more damage than a normal sword. A lightsaber shows innovation and power; a splendid combination.
However, the person using the lightsaber doesn’t have to be a good person. The Siths use red lightsabers and get what they want by force. They are using the innovation and power of a lightsaber for their evil deeds. The Jedi use the blue and green lightsabers, fight off the Siths, and they are the peacemakers. In a constant struggle to have intergalactic peace, the Jedi and Siths often encounter each other. A lightsaber can do good, but it can also cause a lot of havoc and destruction.
Bacteria are very similar to lightsabers, although they have some differences. A bacterium won’t be able to cut through steel, but under good conditions, they can divide into 2 bacteria every 20 minutes. If there were perfect conditions for bacteria to divide for an entire day, there would be over 4 trillion bacteria.
Bacteria are more abundant than lightsabers by far, but the entire concept is the exact same. There are some bacteria that we couldn’t function as well without them, but there are also other bacteria that can be very harmful.
The lightsabers are more known for being able to do good and evil, but the bacteria are able to slip past the lines. The bacteria have a choice to show up as a benefactor or a malefactor.