Morality is universal (independent of time and space), just like universal is law of gravity or Archimedes law. Morality is provable rationally (using logic) and empirically (using observations and experiments).
The law of gravity doesn't say "you shouldn't do x", it just is.If you want to go against it...well you can't.
And while you can give a false prophecy by doing math wrong, you cannot go against it. If you put 1+1 balls in a box, you will have 2 balls in that box. You cannot end up with 3 or 1.
I don't see anything similar with morality, you can do stuff that is considered "immoral".
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It is morally wrong to initiate violence against humans or threaten them to use violence. Initiating violence or threatening to use one contradicts the property law (you own yourself). Noone should initiate violence against you. Neither should you do it against others.
It is also morally wrong to steal properties from other humans.
You are already mixing in your own opinion and bias.It is also morally wrong to steal properties from other humans.
Why do you assume there is such thing as property for humans?
We could have a society in which nobody owned stuff, it is possible. (I'm not trying to argue if that's a good idea or not)
Why do you only include humans? What about animals? What about plants?
What about the violence we have to do in order to eat and survive?
