I agree, it's pretty odd behavior! I will post my thoughts a bit later today.I assume you listed these to support the ETH.....can you talk a little about what you personally believe the 'alien agenda' to be?
Why fly around to be seen it they are covertly investigating earth? If they are gathering data ...would advanced aliens need so much time...far more than decades to figure us out? Couldn't they just tap into our computers, etc..? Does any of this add up for you to logical actions of any scientifically advanced race?