Not constantly. It has happened because there are those in the future who sought to kill us. My husband, his mother, and those close to him. The entity we rebelled against knows we are important, and that we are all that stands in its way. And we were able to stop the intended plan and sometimes events in our present altered the future to come.
I'm still not happy going into full detail...I still don't trust Skynet not to come here. Hopefully that's enough explanation