Idiots don't benefit from traveling back in time
This movie is one annoying waste of talent. Whirling cmaeras pointed at a laser light do not a special effects make.
And even if people are cognizant that they were able to travel back in time, stupidity remains with them. They do not get any smarter (running away from a criminal leaving the shotgun with him is not smart, being able to push the criminal throw glass window and not picking up the handgun and letting the criminal pick it up for himself is not smart)