The evidence which supports economic freedom as the most effective way of bringing people out of poverty and creating the most prosperous societies is overwhelming. Absolutely no evidence exist that support those opposing economic freedom. In addition, coercive intervention into the economy through burdensome regulations and taxation is immoral as it denies our fundamental right of individual liberty. Experiments in communism and socialism have ended in complete disasters. Indeed, they led to the deaths of up to 100 million people during the 20th century (Soviet Union, China, South East Asia, Cuba, North Korea and elsewhere). Invariably, claims are put forth that past trials in government-run centrally-controlled economic system were not implemented properly. No matter how many times socialism fails (and it always will), they will use this argument.
Some take the stance of using a mixed economy which incorporates some free market elements with some government regulation is the proper approach. This is called the "third" or "middle" way. Those advocating for this are really just selling out on economic freedom. As governments grow in these societies they will crowd out the free markets and bring loss of prosperity and more poverty due to the inevitable economic restrictions placed on individuals. An example of this are licensing laws that place a barrier on individuals who are trying to make a living in a particular occupation or trade. Convincing evidence for the benefits of economic freedom is as simple as looking at the economic freedom index. Those countries near the top of the economic freedom index are the most prosperous and have the least amount of poverty those near the bottom have the most amount of poverty and are least prosperous.
The bottom line is that economic freedom is about the sanctity of individual rights and liberty. These were the principles fought for and codified by the Founding Fathers of the United States of America who were inspired by the Enlightenment Ideals of "Life, Liberty, and Property" developed during the "Age of Reason".
Read and learn about current events (not covered or lightly covered by mainstream media); most importantly learn from the greatest intellectuals of the past (e.g., Von, Mises, Hayek, Hazlitt, Friedman) and current era (e.g., Yaron Brook, Thomas Sowell, Walter Williams) that base their observations and philosophy in objective reality and the principle that your life and your own personal flourishing is your primary moral goal.