She told a female friend two months after his death that she ordered him back into the truck where he died of carbon monoxide poisoning. Why would people think he'd obey her 'orders'?
I know people have told other people to commit suicide, perhaps not all the time, but it has happened. In some states of the US people have been prosecuted for urging others to suicide. In many cases there is documented evidence.
But according to HBO's series 'I love you now die' there is no actual evidence other than her boasting about it to a friend; when her friends were very selective about what they believed about what she said.
The whole thing to me sounds like blaming the female rape victim for her supposedly having so much power of males that the female is responsible and to blame for the male raping her in the first place. Did Michelle Carter have so much power over Mr Roy that her telling him to get back into the truck was an order he must obey?
I find this all rather insulting to males that they have no self control. The rapist is a complete victim to females that he had no control over the situation, you could almost say she raped him - and no doubt some men would say this is true. Similarly Mr Roy could have hung up the phone, turned off his phone or even blocked her calls completely if he hadn't decided to commit suicide.
In my opinion it is nothing more than blaming the victim for the situation they had no control over.