This whole we should have penalties that fit the crime thing is so wrong.
You broke the rules, the rules state the penalty, everyone knows it, so just get on with life.
To follow on with peoples example of speeding on public roads, if every speed camera was accurate and set at 70.0mph, and the penalty was lifetime ban from ever driving again, if you go over 70.0mph no one anywhere would ever drive faster than 60 or 65, just in case.
Because to be fair not every camera even works, and there is generally a bit of a leeway till actual prosecution (10% +2mph or whatever it is), and even then its only 3 points, people think its worth taking the risk, as you are unlikely to be caught most of the time, (not enough police or cameras about), make it a proper penalty, a serious deterrent, and people stop thinking its worth the risk and just obey.
The rules and penalties need to be black and white, with zero grey areas liable for interpretation.
Every time anyone brings interpretation into it, or stewards judgement, then there is perceived leeway, and that is wrong.
Lets face facts here, these guys are among pretty much the best riders in the world, they have the skills to never jump start, always ride between track limits and never go outside the rules, but they constantly weigh up options and decide if its worth taking certain risks or not, here and there, as they ride round, looking for minor gains that, will give place gains, that add up to more points in the championship.
Make it an instant 3 race ban every time their wheel touches or crosses track limit lines, and they will ride within in them without fail, and there would be zero need for long lap penalties or ride through penalties etc. as the minor gain of crossing a track limit line here and there is not worth, a 3 race ban and the points that will be lost because of that, so every rider will perfectly ride within track limits lines.
Ok so slight exaggeration, but you get the point, rules are rules, and need penalties that people do not want to incur no matter what.