I have many reasons, but I'll only name a few: Millions have lost their current healthcare plan and doctors, ACA will add over 1.3 million dollars to our national debt in the next 10 years. Obamacare raises taxes on millions of Americans Obamacare will cut 2.5 million jobs through 2024. I could go on but I won't. All the facts stated above are from the CBO (Congressional Budget Office)