Yeah? What if shit goes wrong? What if they turn out not to be friendly? Then things will turn sour... and because you're the tool, the one who did it, they'll blame things on you.
This 'plan' shit... how can you really trust a plan made by a bastard who lived hundreds of years ago? He couldn't predict everything. People change. These aliens probably have too. So how the fuck do you know you're not being set up for failure?