I see that you understand. But that logic does not make sense. For example: The speed limit on a highway is set to 50. Everyone on that road is going 70. The speed limit for that road is not 70 since everyone is going 70.
I agree bad drivers are bad drivers, and that they cause problems wherever they are. That is why there is a vote kick option on most servers. When passing slower traffic it is up to the person passing to make the clean pass. If you feel you can't pass safely in a certain section, then don't pass there.
The chicane is a part of the track that makes BL2R what it is. Likewise, with any BLR layout, the corner is what gives the track character. It is like the chicane at Monza. Those kinds of corners compel everyone to want to get the best start for the position advantage, because they can not be taken two abreast. I would agree if the Monza chicane were bypassed that corner would be much safer as it would no longer be a corner. The same goes for BL2R. But the character of the track would be gone.
When taking the proper course though T1 at BL2R it is okay to use the sand tap as runoff in the situation of getting squeezed. This is much safer than trying to hold your line. However, this should never be an excuse for blowing though the corner.