Touche Guevara said:
IF Aliens exist (which they almost certainly do)
AND Their technology is better than ours (which is almost certainly is)
AND They do not have our best interests in mind
then I hardly think it matters ... we're fucked.
To use hawking's Columbus metaphor - Columbus (and other Europeans) went over to the America's because they wanted to, and wanted to make their fortunes, and conquer new territory... not because they were invited or contacted by the locals.
So as for 'drawing attention to ourselves' if the aliens in question want what we have, and do not have our best interests at heart, I don't think there's a lot we can do about it.