Because its Hillary. Her base gets larger when opponents use personal attacks against her.
Its hard to understand why questioning Hillary's violation of various laws n winning her first election and then covering up her actions is a personal attack. It relates directly to her misconduct in winning her first election and obstructing all efforts to hold her accountable.
It might be a personal attack to question things she did in the White House or as a lawyer, but to call her on herv refusal to file truthful reports to the FEC so the voters can know who her largest contributor was in 2000 is not a personal attack at all.
"Hillary is Satan's daughter" is a personal attack.
Exposing fraud with documents and witnesses is not.