VFR is not 'locked out' there are plenty areas you can fly VFR. There are plenty areas where you can fly where a simple call to the appropriate approach unit would mean that instead of being an infringer, you would be known traffic.
I haven't studied every single incident, but I would hazard a guess that almost every infringement is down to inattention.
Either inattention to detail in the planning phase, or inattention to the plan when airborne.
Even more to the point, a lack of adequate in-depth navigation training during a 40 hour PPL rating.
The one time I would maybe, just maybe, relent on the above is if an aircraft suffers an amergeny then strays. Even then I would be disappointed that the pilot did not follow the 'Aviate, Navigate, Communicate' principle.
If you are flying VFR with a zone to your right, then even in an emergency you should know you don't turn right and cause an infringement.
Navigation is not difficult however it is lacking, either through ignorance or laziness, in some pilots. These pilots are the ones that cause iinfringements.
Control Zones don't change on a daily basis, the information is readily available. The 6Ps taught in military flying are as pertinent to the hobby flier.
Prior Preparation Prevents Pi$$ Poor Performance.
Sorry if that comes across quite hard but it is a bit of a bug bear of mine.
The airspace might be tight, but it is not locked out and it is certainly not an excuse for poor airmanship.