In Flashpoint Paradox, we see an alternate timeline where Bruce Wayne is the one that was gunned down in the alleyway, and Thomas Wayne survived to become a darker, gun-toting Batman. Cyborg has become the president's leading expert in a super-human task force. Superman has spent his entire life isolated in a lab after crash-landing in Metropolis. The Atlantians and Themescaria are at war with one another and quickly sending the world towards a no-win scenario.
This is explained to be the result of a "Time Boom" caused when The Flash travelled back in time to save his own mother...something that has no connection with any of these and many other changes that have occurred in the Flashpoint timeline.
How did The Flash saving his mother in the past change so many different things that were not directly related to how The Flash changed time?