tWitch's Widow Allison Holker Defends Talking About His Alleged Drug Use

tWitch's widow Allison Holker says she has a good reason for blabbing to the media about his alleged drug problem ... she says she's just trying to help others. Allison defended herself Thursday amid a barrage of online attacks from her late husband's friends and family, who are all pissed off about her recent media interviews and upcoming memoir ... where she touches on his alleged drug use leading up to his…