Since they
(more than 1 species) have been coming here for thousands of years, I doubt that they intend to attack us now at this late date. --- See the new program
'Contact' on the Discovery Channel, for some good info, although they also don't have a solid clue about the alien's intent. It's time for the government(s) of the Earth to open up on what they know, and have known for a long time, but have kept from the general public.
CONTACT - New Episodes Wednesdays at 11P 1 Season At a turning point in UFO history, six experts deploy CIA-developed link analysis software, special ops intelligence training and boots-on-the-ground journalism in an unprecedented global investigation to determine if aliens have made contact with Earth.
https://www.discovery.com/shows/contact
JMOHO, but from what I've seen, they are not hostile and have been helping humanity progress for a very long time. If some are hostile, then it seems to me that others have been protecting us from them.
New military personal are coming out almost daily to report what they've seen and know.
Full Disclosure is getting closer by the day. I've been waiting for this to happen for 50+ years.