Correct, capitalist democracy is not democracy at all. Within capitalism, the ruling class either wins, or has the tools to walk back a loss, such as couping Allende in Chile after he won democratically. Both Trump and Kamala Harris are examples of genocidal imperialists, both are representatives of the ruling class, every president has been a representative of the ruling class in US history.
If enough of us voted for PSL, the state would work against that unless we overthrow the state and replace it with a socialist one. This is reality, and as long as you remain trapped within the narrow mindset of bourgeois faux-democracy as your only option, then you will never get the change we need.
You keep seeing the state as outside of society, outside of class struggle, outside of how we produce and distribute. If we understand the state as a part of society and not outside and above it, then we have to recognize the class character of the state.