That falls apart a bit when you consider that Capital, ie the tools and materials used to create Value by labor, is itself a combination of labor and natural resources. The context you speak of was not created by a Capitalist owning said tools, the act of arranging and managing labor is of course itself also labor, but that labor is not derived from Ownership, nor does said ownership provide labor nor value. It's separate.

Your employer provides nothing that isn't earned by the value of the labor of its employees

produce more value than you could on your own

Sooo... more value that can be stolen by capitalists?

the context that your ~~employer~~ fellow people doing all the actual work has provided.

FTFY.

Your argument against "“surplus value = theft” is about as shit as it gets.

but it’s not as bad as some people say it is.

The only reason you can pretend that certain aspects of capitalism is "not as bad as some people say it is" is because of the fact that organized labor have spilt a lot of their own blood fighting to get it to the point of being "not as bad as some people say it is."

Most people want better rights for Workers, yes, Marxism just provides a sound base for analyzing why Worker's rights aren't good in the first place. It's a helpful lense of analysis.

You don't need to be a Marxist to want better rights for Workers, not at all, but Marxism definitely helps. That's why leftists are almost exclusively Marxists in some fashion, even Anarchists acknowledge Marxian analysis of Capitalism.

Yes, because for you to get those profits, you had to not pay your workers the full value of their labor power.

Yes. Because you get to have a second location and your worker who created the value with which you opened it doesn't.

No, its just that you get to keep all of the profit.

When you work for a capitalist they pay you a portion of the profit your labor generated to cover your labor cost (food, shelter etc.) and keep the rest for themself.

It might be better understood in Marxist terms: you have the cost of your input materials and the cost of the labor-power needed to transform them. Subtract them from the output value of the labor and you get the surplus-value. The capitalist will keep the surplus-value the laborer created for themself and the laborer gets enough to cover the cost of maintaining their labor-power.