G'day dj, I'm only asking that VFR listen out on the area frequency! That's all it takes to avoid these situations. It's not much fun watching radar paints point at each other, merge..........and wait for them to come out the other side. Neither of them monitoring, really, how hard is it to look at a map?
The 'mistakes' that you speak of are not mistakes, they're good airmanship to speak up
(if I was half the pilot you are, I'd be a happy man
) The real mistakes are to just not give a crap, press 'direct to' and blunder through CTAF's without any regard for others.
We are there to deliver a service, makes it difficult if folk don't give a rats. Haven't even got the brains to turn the transponder off if they're going to behave in that fashion. Then again they probably don't know how to turn it off.