That consists to a great extent of maritime generated garbage - plastic fishing nets and plastic thrown off of vessels, and of course lots of "recycled" plastic that was being shipped to China and ended up dumped in the middle of the ocean.

Putting your trash in a local garbage dump is EASIER and CHEAPER than putting it in the garbage patch in the Pacific, so stop doing that right now.

Incorrect. If I throw my plastic bags out on the road it's much easier. It'll find its way to the Pacific eventually

This is a problem with the (lack of) environmental laws in many countries. All things considered, landfills are really cheap.