Why Doesn't "Team Flash" Just ... Not Worry About It?

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I've been watching The CW's DC adventure-series The Flash (about how Barry Allen was ... struck by lightning-mixed-with-nuclear-energy or something ... and became the fastest man alive, and now works with a team of nuclear-energy scientists to 'help' other "meta-humans" like him (imprison or destroy the bad ones, mostly)). A current story-arc has him traveling so fast that he discovers how to travel from parallel universe to parallel universe, getting a glimpse of the future, where he sees that one of the super-villains is going to kill his wife---right in front of him. And the crux of the story-arc is 'him worrying about whether he's going to get fast enough to stop Savitar (the super-villain) in the future.' Forgetting for a second that--since the future hasn't happened yet (not even in 'the present of fiction)--the "future" he saw isn't even real; Barry's living in a universe where there have been three identical men posing as the lead scientist (H.G. Wells), where ... how does he even know that the girl he sees die is indeed his wife and isn't Savitar themself? (Maybe his future vision involves some sort of Ethan Hunt (Mission: Impossible) face-switching going on?) Why doesn't Team Flash just cool-off & deal with things wisely? ---and yes, the character's name IS H.G. Wells ... no http://www.imdb.com/character/ch0477443/?ref_=ttfc_fc_cl_t5 it's H.R. Wells; but he (his third embodiment, anyway) is a science-fiction writer---well, a science-witness, in that case