Benzos contribute to death in many ways, one of them being as you have mentioned, the ongoing undending brutality of withdrawal will cause many to take their lives. Benzos are on board in as many as 30% of overdose deaths
Benzodiazepines were involved in 12,499 deaths in 2021—steadily increasing since 2015 (NIH).
The risk of overdose is particularly great when combined with sedative drugs such as opioids or alcohol. Benzos increase the risk of motor vehicle crashes (AAFP.org).
Seizures have also been reported with less than 15 days of use and at therapeutic dosage. Almost all the withdrawal seizures reported were grand mal seizures. The severity of seizures range from a single episode to coma and death (NIH)
Benzodiazepines appear to cause an overall increase in the risk of attempting or completing suicide. Possible mechanisms of prosuicidal effects may include increases in impulsivity or aggression, rebound or withdrawal symptoms, and toxicity in overdose (Dodds, Psychiatrist.com)
Benzos are central nervous system depressants; they lower respiration; when taken with any other drug that is a CNS depressant, such as alcohol or opioids, the chances of fatal OD increase significantly.
Withdrawing from benzos may not kill you; it might just make you so sick you want to die:
Protracted withdrawal syndrome refers to symptoms persisting for months or even years. A significant minority of people withdrawing from benzodiazepines, perhaps 10% to 15%, experience a protracted withdrawal syndrome which can sometimes be severe. Symptoms may include tinnitus,[29][125] psychosis, cognitive deficits, gastrointestinal complaints, insomnia, paraesthesia (tingling and numbness), pain (usually in limbs and extremities), muscle pain, weakness, tension, painful tremor, shaking attacks, jerks, dizziness and blepharospasm[20] and may occur even without a pre-existing history of these symptoms (Ashton).