Gladly!
The initial point I wanted to make was against those (maybe just the OP) that were up in arms about somebody being unsafe and willing to turn him to the FAA. I'm not a fan of that attitude because there's plenty of self inspection that should be happening before being willing to turn a fellow pilot in. For the most part, the OP had no idea what was really going on with the other airplane and should leave well enough alone.
But, I brought up MOAs because other than some of the buffoonery going on around some small GA airports, the biggest problems I've had have been in MOAs. Many VFR pilots love to talk about cloud clearance requirements (on one of my recent BFRs the CFI spent about 20min showing me a good way to memorize them), but will fly right into a MOA with no clue as to what is going on in there or what hazards are present. So I would ask, what makes you think you are safe just because the rules allow you to do it? Do you know that very few of the safety incidents between mil/civ aircraft in MOAs are reported? There is really no way for a VFR pilot to know what impact they have when transiting a MOA unless they do their homework.
Before flying through a MOA, a pilot needs to know whether its active and if there are aircraft in there. There may be two or there may be ten, and military pilots mostly treat them like they are their areas designated for their training purposes. They are not looking out for VFR traffic they way they would outside of the MOA because they are in there for a purpose, to train. They may be 0-500kts, 100ft-18,000ft, heads down, heads behind them, writing notes, pulling 4Gs-9Gs. Many don't have TCAS are none that I'm aware of have ADS-B. Many don't have radar. I have had numerous close calls with VFR interlopers, and more times than that, I've had to knock off training and wait for VFR traffic to clear the area. More than once, training objectives for the entire flight weren't met because a VFR airplane wanted a shortcut. Doing the homework on transiting a MOA should be just as much a part of the flight as researching the WX and TFRs.
I feel better now, thanks for biting!