By the time he was preparing to get rid of it, he was on Earth, living as a human, without the means to hurl things into the sun.
Personally, destructible or not, I won't be comfortable hurling that thing into a sun.
As for it's creators, they probably don't consider it all that big a deal. A creator probably had other means to check that kind of power, like the Drode suggests of Crayak.
Or they were hopelessly naive like the pemalites, and never imagined anyone doing any harm with it