I suppose it could help. But it also could backfire. Trying to scare the shit out of everyone on every topic, regardless if it's true, seems counterproductive.
The problem with "The Boy Who Called Wolf" (in this case Nate Lerner who is a Democratic Strategist from NY) is that people start tuning it all out when things don't happen as promised. Then when a legitimate concern occurs not enough people are paying attention.
Look I really hate defending Trump in any way, but at the same time, I really don't want another 4 years like last time where people, like my neighbors, went ape shit on everything. For example, they were scared to death that Trump would start a nuclear war with North Korea. Then they were pissed that he "legitimized their regime" by meeting with them at a summit.
I just think people need to be more selective with their scare tactics, otherwise, it just gives more fodder to news cable shows to make fun of when it doesn't happen.