Like most things --- the fact that people don't understand or know how to do something - doesn't make the practice inherently dangerous... People that are willing to learn, and listen, can be quite successful.
Simply understanding the process is critical. Cleaning the gas out of the tank is not overly complicated. Smelling the tank for fumes is not rocket science... and making sure you have an inert gas (of choice) so that fumes are not able to ignite is not hard or expensive either.
The naysayers probably have never welded something like this - and there's nothing wrong with saying "I don't want to do this". Many shops don't or won't work on this stuff because they either A) can't make money doing it or B) their insurance won't cover it.
Like most things - there's the right way and the "I think I know what I'm doing.... the wrong way".
Just FYI -- Antifreeze is flammable and when heated in a tank will also ignite with explosive results.... and there's millions of radiators worked on.
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