Do they not understand that this happens at every level of baseball regarding managers, hitting coaches, pitching coaches, gm's .... It's an accepted practice to get permission to talk to other teams employees of the position you want them for is a promotion from their current role. It's also accepted that if the job isn't a promotion, you don't get permission to talk to them.
There's nothing shady, silly or anything even remotely resembling tampering whosoever. Be mad that you're losing a great FO man, but don't blame the team willing to advance the man's career. Also, don't blame the man for advancing his career.
Fans are dumb.