Re: Question about the episode "Ethics"
Relationships between the Empire and the Federation, and the ups and downs of the Mogh family fortunes, might have been too unpredictable in Worf's opinion to guarantee a future full of Qa'pla for Alexander. Remember how Worf in "Sins of the Father" was quite ready to have Kurn abandon his family if that were the best way to survive...
Worf would also know out of experience that even a Klingon separated from the Empire can learn honor under human foster parentage.
Worf was different. He had a Klingon upbringing until his parents were killed at Khitomer. Alexander's mother kind of messed him up as far as learning Klingon ways. In many ways, Alexander reflected K'Ehleyr's rejection of Klingon culture.
"Great men do not seek power, they have power thrust upon them" Worf, son of Mogh after he killed Gowron, and gave the chancellorship to Martok.