Cee-Dee - you are putting forward your hypothetical scenario of a car crime on an equal level, which it is not. There cannot always be any physical evidence of an assault - an unwanted "grope"  doesn't leave evidence, also there may not always be witnessess (calculated by the perpetrator).

And in my real life, I (and colleagues) DID complain, but naturally, nothing was done, it was simply dismissed as "harmless fun". In those days, it was seen as "the norm".