Mr Lepper made the comments last week after an Auckland man, Ashish Macwan, was charged with careless driving causing the death of his 3-year-old son.
Macwan's son, Aarush, died after the van his father had been driving plunged into Lake Dunstan 12 days ago . Mr Lepper was one of a group of passers-by who dived into the lake and tried in vain to rescue the boy from the submerged vehicle.
Mr Lepper said there was "little to gain" from charging the grieving father and asked for the charges to be dropped.
He planned to lobby local body and national politicians about the wider issue of family members facing criminal charges when a member of their own family had been killed in an accident.
He raised the matter at a meeting of South Island mayors in Christchurch last week and said he received a "sympathetic hearing".
"They all seemed extremely sympathetic to what I was saying and hopefully, they will use whatever influence they can, in the spheres in which they move, to get the matter reconsidered and the law reviewed."
During the week he also received phone calls and messages of support from members of the public.
"There hasn't been a single negative comment from anyone.""Where do I go from here?
I'll certainly be following it up, probably with the Minister of Police and will also be finding out more about police protocols and the justice system."
Many of the comments he received from the public revolved around how quickly the man was arrested and charged. The charge was laid about six hours after the fatal accident happened.
Macwan told The New Zealand Herald he accepted the charge and said the police were doing their job.
His court case was transferred, on an intimated guilty plea, from Alexandra to the Manukau District Court. He was remanded on bail to appear in Manukau on May 11.
The acting Central Otago police sub-area supervisor, Sergeant Mike Williams, declined to comment as the matter is before the courts.
