You, of all people should know that this forum, like many others, is made of people from each side of the fence, on almost any and every subject.
Admitting to committing such an act, and then thinking everyone would pat you on the back is beyond crazy.
You may not know, but grey squirrels will quite happily eat song birds eggs and chicks. Ever noticed how in woods with grey squirrels, there are very few song birds (standing by for the 'that's not true' crowd). Or that grey squirrels like to de-bark young trees about 2 metres up, meaning the tree dies and never matures.
There is a reason why country estates take so much time and effort to keep the squirrels numbers down, and it's not just for the small amount of feed they steal, or the fun of it.
You may think you're just releasing a grey squirrel. But that will go on to kill, and breed. How about I just release some hive beetle? Won't make a difference will it? And then I can drive back at 32mph in a 30