I understand that he is largely popular because he wants to implement free college tuition and healthcare and even even offers ways to pay for them through taxation, but he is not so good on immigration policy. If we start offering free college tuition and free healthcare, then there will be a massive flood on immigrants on our boarders. This will not only make job competition much more fierce, but Bernie would then have to tax people even more to afford the massive influx of immigrants wanting free college and healthcare. People talk about free college and healthcare in a bubble, but they are affected by a multitude of other things. Yes, I understand free college and healthcare sounds nice, but major immigration problems need to be sorted first. I wish the United States could support the whole world, but in reality it simply cannot.
Secondly, I know that free college and healthcare has worked for other countries, but those those countries tend to lack in innovation. The United States is the most innovative country in the entire world. We are at the very top of the food chain when it comes to technological marvels, gadgets, and gizmos. These technological innovations contribute a lot to maintaining the United States status as the world's greatest superpower. In large part, the biggest and most profitable companies are American or started in America. If people start asking for massively increased taxes on these companies for free college and healthcare, then companies are not going to have as much money to invest research and development projects and as a result our country's overall innovation will suffer. If free college and healthcare policies are implemented, then the United States may loose its place as the worlds greatest innovator. As a consequence, the United States would also lose its status the world's greatest superpower. Not to mention, these major companies will eventually just relocate to another country where the tax burdens are less. This will cost Americans hundreds of thousands or even millions of jobs. This is all thanks to the forces of globalization.
I hate corporations as much as the next person. I think they are nothing but greed mongers, but I can see that no single nation is going to be able to combat major corporations without severe losses to its people. Policing corporations is going to take a world effort, meaning governments across the globe will have to compromise and come together for the greater goal of improving peoples lives not of their own country but of the entire world. In short policing corporations is ultimately going to take governments and politicians thinking in a much more global perspective instead of only worrying about their own people. Maybe this is the beginning of the need for a global government.
Besides that last part, the first and second paragraph are why Bernie is not as good a candidate as people want to believe. He doesn't think too far ahead about the consequences of his ideas if they are implemented.
TLDR: If Bernie Sanders policies are implemented there would be a massive rush of immigration toward the United States for free college and healthcare. Ultimately, this would drive up tax rates in order to pay for the surge of immigrants wanting free stuff. Secondly, Bernie Sanders tax policies toward corporations would stifle innovation causing companies to invest less in reach and development projects. Ultimately, this would hurt Americas status as the worlds greatest superpower because America is dependent on high levels of technological advancement in order to remain at the top.