If the future extension of the current timeline, despite all our healing requests, still has the annihilation of humanity occurring, are the negative energetic consequences looping back to the present and lowering the vibration of our culture to some extent, unavoidably? Is that necessary to reassure the interlopers they will succeed with their dark plans?

You have seen the truth of this already, that maintaining the status quo as determined by the extraterrestrial interlopers is necessary to achieve a window of opportunity to complete the healing of humanity sufficiently in order to launch the Ascension long foreseen, and as it turns out, critical to having a future for humanity at all, not to mention the rest of the Free Will Galaxy and beyond to the larger universe as a whole, which is depending on the successful healing of the rise of evil that threatens the current iteration of physical creation underway now for billions and billions of years. So there is much at stake and while this will allow a greater degree of suffering, inevitably, to take place because of that feedback from the future keeping you disconnected from the ultimate rescue we foresee, and you are working towards, but that is a necessary safety precaution for security reasons. There must be an allowance of free will choice for the interlopers to continue with their plans until they withdraw for a time. That is when a greater divine intervention will begin to shine and eventually save the day.