At risk of being callous, why should they? If an employee already dislikes a company to the point that a recruitment letter angers them, why should the company go out the way to accommodate them? The amount of effort it would take to throughly research every recruitment letter recipent seems like it would be a largely pointless endeavor with minimal returns. Most people aren't going react negatively to an email feeler and the ones that do are already a lost cause.
>At risk of being callous, why should they? If an employee already dislikes a company to the point that a recruitment letter angers them, why should the company go out the way to accommodate them?
So that they don't write blog posts like the one we are commenting on? So they don't actively try to convince other (possibly talented) potential employees to ignore your recruiting efforts?
The entire comments section here seems to be "is Google a horrible company to work for and does Google+ suck, or are they merely ok?" If you're looking for new talent, wouldn't you rather have prospective employees asking "is Google a fantastic company to work for or an outstanding company to work for?"
They need to improve their recruitment emails and they could by cross reference their list with a list of people who have left your company at least. Personal emails can be collected on exiting the company if Google needs to contact you.
The only thing on the line is reputation and people don't like to be "spammed" unless they ask for it.