Your point of view does have some merit. The dilemma with pest species in general is that if nothing is done, then the invading species takeover. So, if the Indian Myna is not killed, it will kill others, take over their habitat etc. So our collective lack of action results in the deaths of native species, that are already under threat on many other fronts.
You point is more about creating a more humane way to deal with Indian myna. Personally, I don't have a problem with breaking necks. Its quick, painless and cheap. The more important issue is that 'something' needs to be done.
What I do find amazing is the total lack of action by the Victorian Dept of Primary Industries. While it states that the Indian Myna has been listed by the World Conservation Union (IUCN) as among the world’s 100 worst invasive species, it also does not declare myna's as a pest species at all and therefore has no programs in place to control its rampant growth.
This is what the government's position is:
"The Indian Myna is not a declared pest animal under the Catchment and Land Protection Act 1994. The Department of Primary Industries does not consider it reasonable to impose the lawful responsibility of control of Indian Mynas upon all landowners (including those in suburbia) when it is unlikely to result in the desired outcome of 'eradicate or control or prevent its spread in the wild' (the requirements that must be satisfied to be able to declare a species). The Department does not implement specific programs to control Indian Mynas."
If you want more on this check out this site (address below). Also contact your local member, write letters to the editor, the minister for the environment. I don't see the point of trying to save a whole lot of other species, create habitat etc unless our governments develop plans to reduce and control these 'rats of the sky'. Its just not good enough for the issue to be left to landholders.
http://www.dpi.vic.gov.au/agriculture/pests-diseases-and-weeds/pest-animals/ag1415-indian-mynas