Why is there a stock market in the first place? Why cant the lawmakers just abolish the stock market?

You havent given a good reason to close it. It makes no sense to close it just to close it. Youve got a lot of understanding about the system to do, kiddo. 

Go back to Cuba or Venezuela.                  

Nearly everything you wrote in your question is either categorically false or a gross misunderstanding of finance and economics.

You should go back to where you got your finance and economics credentials and ask for a refund.

 Are you your family's first intellectual or is Common Core getting the credit?

So you want to lock me out of adding shares or disposing of shares if I need cash to purchase something? You'd keep business out of being able to sell shares to raise capital.  

There is far more simple solution, just don't invest into the stock market.

Capitalism runs on the funding from selling portions of companies to purchase assets. These partial ownerships of companies are called stocks. The only time the company benefits is during the IPO, the Initial Public Offering of stock. After that the shares of the company can be bought or sold to the public in the stock market. Abolishing the means to generate capital for business would mean the end of our economy. We would become Venezuela.

Correct...its just an easier way for people to invest in businesses and diversify their assets.  Rather than having all of their assets in just the one company they own.  

It also allows some of the profitability of a company to be split up...

So, without a stock market, you'd have a much harder time to buy or sell your business...easy to not care if you have no assets...

Wow, you're clueless.

"These things called shares" are shared ownership of the businesses.

They determine who receives the profits and who makes decisions about what the company will do.

Most people who have a great idea for a new product or a better way of making a product, don't have the money to start a business. They get that money by selling shares. If the government abolished all investing, then no new businesses could ever be created. If the government did allow start-up funding but no secondary market for shares, then it would take so long to make your money back that still nobody would invest. And of course without small participations from the general public, there would be less money available to invest.

As for that general public, owning businesses protects your savings against inflation. 

The stock market has made more millionaires out of ordinary middle class citizens than any other financial method.

The average middle class worker can contribute a small percentage of their paycheck throughout their working life, into a properly diversified portfolio, and retire with over a million dollars.

You aren't going to gain much support for abolishing it outside of the radical Bernie Sanders crowd, and most of them will realize its value when they grow up and get a few bucks to their name.