We would say that life has twists and turns. All are learning or continuing to learn here. Some believe they must move in a more radical, yet exclusive manner to assist others. They see their way and thought process as the only one of merit and value. They become lost in this delusionary thinking.
Know that one way is not the exclusive way and that many alternate realities can get you to where you seek to go. So yes, travel your own path, but do not believe that others cannot reach their destination exclusively through what you believe to be the best or only way.
Life choices exist and when the belief exists that life can be better because of the elimination of another, take another look. In mass shootings, if another believes they can make their own life better by ridding the world of these other people, there is a mental disturbance there. It is without merit in thinking such violence would make the difference craved by such individuals. How they might think such occurrences would help alleviate their own mental suffering is lacking merit. We offer this.
Within your own life choices, always stop, pause, and connect inwardly so you might know if this or that path benefits the one, the whole, or any part of life.
All are Connected
Since all are connected, reflect on how the death of another or many, might benefit the whole. This would be difficult to ascertain. Where there is a perceived self-benefit or benefits solely for self-gain, then there is not a benefit to all of mankind.
We cannot help you rationalize such acts and advise you to take each step from a space of love. Draw in love. Realize that love is the connecting element that has been missing here. In such occurrences, do you see how the circumstance would be diminished were love engaged initially? Seek love first so that other dynamics come into play, allowing new options to come into view.