If you don't think the sky is falling then I'm afraid you simply haven't been paying attention. Here are just a few of the things Trumps administration has done / is in the process of doing:
1.) Trump's administration has gutted the State Department and is severely curtailing the US' ability to respond to world events. https://www.theguardian.com/us-news/2017/jan/29/state-department-purge-trump-foreign-policy
2.) Trump has put in charge of the EPA a man who doesn't believe in global warming. https://www.theatlantic.com/science/archive/2017/03/trumps-war-on-the-climate-begins/519159/
3.) Trump wants to cut funding to the the UN by over 50% which would cripple peace keeping operations all across the globe. http://thehill.com/policy/international/un-treaties/323781-trump-wants-un-funds-cut-over-50-percent-report.
4.) Trump wants to cut funding to the coast guard by 1.3 billion dollars which would allow illegal drugs and weapons to flood into the country like never before. https://www.aol.com/article/news/2017/03/13/nearly-60-congressmen-have-called-trumps-1-billion-cut-to-the/21884818/
5.) Trump wants to cut funding to the TSA and FEMA by over 900 million dollars which would make already long airport lines even longer and severely inhibit our ability to react to natural disasters and provide funding to states declaring emergencies. https://www.nytimes.com/2017/03/09/us/politics/trump-budget-coast-guard.html?_r=0
6.) Trump wants to increase our nuclear arsenal which increases the risk of proliferation and increases the likelihood of other countries starting nuclear programs. http://www.reuters.com/article/us-usa-trump-exclusive-idUSKBN1622IF
7.) Trump is poised to start a trade war with our two biggest partners in trade - China and Mexico which could skyrocket the price of food and goods here in the states. https://www.forbes.com/sites/danikenson/2017/02/06/not-much-left-stopping-trumps-trade-war-with-china/#911126d4d1cc
8.) Trump has said he wont defend members of NATO which has greatly increased the threat of Russia to our European allies. http://www.cbsnews.com/news/nato-jens-stoltenberg-russia-vladimir-putin-us-europe-allies/
9.) Trump as made of White House Press Office a bad joke and the office of the President lacks all credibility. When the wolves really do show up no one is going to believe Trump because he's cried wolf WAY too many times. http://www.cnn.com/2017/03/13/politics/sean-spicer-donald-trump-wiretapping/
10.) Trump is making health care unaffordable to the lower middle class but is giving huge healthcare tax breaks to the rich. https://www.washingtonpost.com/national/health-science/critics-say-aca-risk-strategies-are-having-reverse-robinhood-effect/2016/01/13/e41cf574-b48f-11e5-a842-0feb51d1d124_story.html?utm_term=.1de4c4e87bae
Anyone of these by themselves is cause for immense alarm. Instead of attacking liberals for claiming "the sky is falling" maybe you should try opening your eyes.