Will targeting of individuals end quickly if the extraterrestrials withdraw from our world, or will much further healing be needed because of programming in place?

Both consequences will be observed depending on the individuals and the prior history. There will be an abrupt cessation in the lack of new attacks being mounted because the willful intent of the interlopers will have withdrawn, but there will still be a body of mind manipulated human minions primed to go on the attack and to target persons of interest to the Extraterrestrial Alliance, who may continue their mischief once the Alliance membership has withdrawn and no longer interacts with them to give them new marching orders. They will still be acting on prior instructions and so many ongoing sources of irritation and interference may continue on autopilot, so to speak, because the extraterrestrials will not likely take the trouble to rein them in and change their marching orders as an act of kindness. On the contrary, they will want there to be continued mayhem and degradation of human society, but the healing underway will gain in effectiveness and increased momentum because there will no longer be increasing headwinds from new attacks being launched by the Extraterrestrial Alliance against so many people on a daily basis, so there will be a huge drop in the overall negative energies influencing humanity and this will be noticed but it will not go to zero quickly.