Talking about gravity: money has keplerian caracteristics. More money goes where there is a mass of money.
Banks create money through lending: they prefer to lend to wealthy, solvable individuals and corporations.
Taxes are just one measure to maintain the balance by redistribution.
If taxes are used to redistribute wealth, then I'm having nothing of it. What you're suggesting is that when certain individuals (or groups thereof) of society acquire wealth of "greater value" than what "value" you think you have, you try to "even the score" by stealing from them and giving it to those who have less. There sure are a lot of people in this forum who have a "robbin(g)hood" complex.
So stealing is legally acceptable? That's not even considering the fact that banks, if they're permitted to issue "legal tender" laws, are also stealing from the mostly unsuspecting public when their currency gets debased by willy-nilly fiat inflated paper.
Talking about medical insurance: health care is not about making money.
To be a medical doctor or a nurse is a to have a job that makes sense.
Everyone in need should have access to free medical care.
Why wouldn't health care be about making money? Why couldn't it be charity-run too? You have a job only because somebody else values your skills and are willing to give you something in exchange for it. I suppose it would be nice to have free medical care, but you shouldn't force me to give it to you. I like free as much as the next person, but if it's not, we shouldn't be stealing to get it.
A trader may make a ton of money but he or she is wasting is time on this planet.
Derivates are toxic instruments that should be outlawed because incompatible with sustainabable development.
By the same token, shares in any corporation should have a minimum holding period of one quarter.
Etc...
Walmart could be defined as a trader. It buys products from suppliers, ships them to a store where they inventory and shelve them, and then they trade them for a profit, hence trader. You should be more specific.
There is nothing wrong with derivatives specifically. The only 'derivative' I don't like are fiat currencies. If you think about it, most fiat currencies are derivatives of some sort, so in a way it depends on who wants to play what game and based on what rules. Are the participants in said market willing, able, and knowledgeable? If you can't make heads or tails of a contract, is it a contract?
Anybody should be able to hold a share of ownership in a company for as long as s/he wishes. Again, it all depends on the specific contract covenants.