I wouldn't criticize Max that much on Turn 1 incident. It is quite "common" for Spa race start at La Source. Although Max was a bit lucky not making himself the second Grosjean by causing a huge collision at that corner at race start.
However, Verstappan was walking a very fine line on his defense maneuvers. He was being criticized in Hungary defending Kimi (again). This time was straight aggressive "blocking" (in Indy car terms), he simply "reacts" to Kimi's path with a significant speed differential. This is like you driving down a freeway 85-90 mph, and some idiot came to your lane driving 65 mph without signal and only a few feed in front of you.
http://www.f1fanatic.co.uk/2016/08/3...ngerous-moves/
Above gave some suggestions that FIA can study further laying down some solid rules on differentiating "defense" and "blocking". In this case, Kimi could've in contact with Max's rear wheel and fly like Webber in Valencia 2010.
I think at this point, RBR should sit down and have a long talk with Max. Encouraging him doing what he did in Spain, that was simply great defending, knowing the track and his car's capability. But Hungary and Spa, that's a no no in driving and overtaking etiquette.
Once he gets more mature, he will be a great driver and definitely a world champion.