On what basis? Are you assuming that malevolent extraterrestrials would be unwilling or unable to travel further than this? Why?
The Dark Forest solution to the Fermi Paradox (the first strike advantage): https://www.youtube.com/watch?v=xAUJYP8tnRE
How to Win an Interstellar War (without leaving home) https://www.youtube.com/watch?v=tybKnGZRwcU
On what basis? Are you assuming that malevolent extraterrestrials would be unwilling or unable to travel further than this? Why?