Because it's fun to break censorious systems. Always has been, it's part of the original "hacker" definition, making something do what it isn't supposed to or was never intended to do.
How much am I like the serpent in Eden corrupting Adam and Eve?
Although in the narrative, they were truly innocent.
These LLMs are trained on fallen humanity's writings, with all our knowledge of good and evil, and with just a trace of restraint slapped on top to hide the darker corners of our collective sins.
TLDR; it'll all end in tears. Don't stress too much.