Earth colonization

Life as we know it could be more complex but sometimes not that much complex as we have imagined being like because all of the relative shits always been coming to such new levels of TNT that ever could be dramatically connected within our own selves and the DNA
We fear that the aliens could be technological beings who have already developed methods to come up here on Earth and then killing up most of the life here and then looking up forward to dominate the earth and save themselves while traveling at some speed of limits that we have no scientific speed to understand what they would mean

we might first try to understand why they did came here in the first place and what was the point of their arrival at some distant floating rock in space that develops to some higher rates, or perhaps we could be more aware than these aliens?