1. I have observed legal citizens living cheaply and sending most of their money to other counties. And I have observed illegal aliens spending most of the money they earn here. It seems to depend more where their family is, and less on legal status. At any rate, if you study the value of the dollar, then you learn that when lots of currency is sent to a country, and becomes a de facto currency of that country then that increases the value of the dollar.
2. If ALL government jobs are net losses then we should stop building roads, water pipes, sewer pipes, medical research etc. The military folks are all government workers too. So you would want to get rid of them as well. 'nuff said here.
3. This is one half true. Give them opportunities to grow their money and they'll come-a-running to invest. Yep. The rest, utter BS. I would rather invest where I can grow my money at 23% and pay 33% of that in taxes, than where I pay 0 in taxes, but my money only grows at 3%.
4. I am not going to touch the WWII thing because the original poster took a leap from causes of great depression to the start of WWII in one sentence. His attempted point was more on the need for guided capitalism anyway. (I think)