I think you'll find Symon, it's because they appear to be referring to the actual daylight changing when in actual fact the daylight remains the same regardless. It's the clocks that would be changing. Although i don't have a particular opinion on it either way, we did try it a while back and it was'nt all that popular and did'nt suit the majority. I think the old saying of "if it ain't broke then don't fix it" comes to mind here. 
I agree, and that's my point - states have daylight savings to 'give' them an extra hour of sunlight in the afternoon to do things. The people highlighted are pointing out the fact that moving the clock doesn't make any sense as at Yorkeys Knob there is already enough daylight in the afternoon to do things, so moving the clock back to 'give' an extra hour doesn't have any real advantages.
The fourth person is merely pointing out the fact that there isn't much seasonal variation in the length of the day between winter and summer, so again there isn't much advantage to be gained from daylight savings.
Since the pointing out undeniable facts makes them 'dim' or the subject of ridicule I again question the motivations of those making the accusations.
To cap this daylight saving debate off why don’t we also have one time ZONE as well?
Now that's a debate worth having. The entire country could be on one timezone. The eastern states move their clocks back an hour, the central ones back half an hour, and WA forward an hour. No daylight savings, everyone is on the same time for the entire year.
Wouldn't that cause some arguments.