It is not the drivers place to make a judgement call on what is and what isn't safe for a marshal, a marshal's life is none negotiable when there is an incident where he/she is put in danger he/she is the most important person on or off the track bar no one, and a lot more important than a driver trying to prove a point.
In the two practice sessions I saw two drivers lose control of their cars and hit the barriers, there was no guarantee that Lewis or Perez were going to negotiate that part of the track safely, it is not good enough to say in hindsight "nobody was put in danger" and anyway the statement is blatantly not true.
I wasn't denying the penalty as he fully deserved it. The threads called broken Lewis so I was just adding my 2 cents.