What should I do about a criminal getting a light sentence?

There is someone who has hared my family and committed violence toward them for years who will be sentenced in a Texas court next week. He was convicted of reckless injury to a child, a state jail felony. This was his sixth felony conviction, five state jail felonies and a second degree felony for burglary of a habitation. He also currently has pending felonies in another county for ault of a police officer and escape causing bodily injury. He was also recently given a revocation of his parole by the Board of Pardons and Parole, but I was told that at most he would serve 3 months on the revocation. At any rate, the DA in the county he was convicted in would not enhance the charge, even though it was his sixth felony. So the recommended sentencing is 6 months to 2 years and he has already sat in county jail for a year, so if they just sentence him to 1 year, he will do no more jail time for beating a 3 year old. Along with the parole revocation he may only do 3 months total for both. And the scary thing is the two pending felonies are in a county that has not given him any significant jail time for all the previous felonies he committed. So my question would be, is there any use in writing a congressman or the Texas attorney general to tell them about this situation or is it a waste of time? Does anyone else have any suggestions?