“And God Himself shall wipe away all tears.”
The oneness of all of creation is a given. There is no need to strive for it or to somehow make it happen. All that is needed is the willingness to let go of mistaken notions about what creation is.
The images you see in the world are not causing you to feel distress, even though you may think they are. They are simply the reflection of unhappy thoughts and feelings that are present in your mind. You have allowed a loop to catch you in its hold.
The way out of the loop is to think new thoughts, thoughts that come to you when you focus on the good and the lovely in what you meet as well as the good and the lovely that wells up within you. Dare to trust those thoughts and feelings and stay with them, and as you do, they will expand in your experience, both outwardly and inwardly.
Then tears will belong to the past, blown away by the wind.