That's not harsh, its irresponsible.
When a person decides to own an animal he/she becomes responsible for that life. Its the inevitable fate of most roosters to be culled but it should be done with care and respect not as abandonment to terror in the night.
Not to mention releasing a domesticated animal can have a huge impact on the ecosystem. Domesticated animals can carry diseases that their wild counterparts have no resistance to. And it's also pretty cold