This is one example of a time where you can see Jumba's reasoning. Yaarp's ability to pulverise structural integrity with sonic blasts is an idea you could really imagine Jumba thinking up and deciding to use.
Although it would probably be more effective for an experiment to target a resonance that would destroy a building. But hey, then we wouldn't have had any loud noises.
Having Pleakley get some limelight is a good idea if you think he's underappreciated, but a bad one if you're one of those people who hates Pleakley and thinks he's annoying.
An alien invasion alarm is one of the most useless ideas for a true place, ever. I dread to think how bored Yaarp would get. And this is another episode where they try to push the moral too hard.