Investments are the money doing work. You do not invest in a company so that the company can just sit on the money. They take that money and spend it doing things like growing their business, hiring new people, buying supplies, investing in growth, creating new products, and other things. When you put money in a bank it does not just sit idle in a bank. That money is also invested, it is used to loan other people money, it pays salaries and works. Unless you are storing it in a shoe box, or a proverbial shoe box, it is working. Obviously you should have some in a shoe box so that you have access to it.
So, after you take someone else's money what are you going to do when that money is gone? If you stole all the money from the 1% you could run the federal government on that money alone for a grand total of a little over four days (using someone else's math but checking it indicated that it was the correct sum) and then they will have the same situation they were in before (and fewer investments in short or long-term growth) and, worse, because of all the money being exchanged and the wealth removed the deflated dollar will have even less buying power than it had before that.
YTMND! So, what is next? You have no more wealthy people but you do have a bunch of new people who collected those lowered-value dollars. Are you going to take it from them next? How many times are you going to do this? Are you going to drive the country into the ground as quickly as you can or are you going to make it slow and painful?