If a person assumes themselves to be a member of the elect, as some tend to do, then perhaps it's only "natural" to also assume that the enemy is reprobate. In which case, something reminiscent of fire and brimstone might seem like a "perfect" solution.
The Protestant mindset is founded on such presumptiveness. That's where it's appeal is: it elevates the ego, it nourishes self-rigtheousness, it sanctifies the sinner. It is tailor-made to human egotism, to the love of oneself; it is flattering that an ordinary person can now consider himself a "saint" with a "mind of Christ" and an "indwelling spirit." It is boastful and prideful and elitist to consider oneself the "elect."
It is truly a miracle that Protestant Reformation did not obliterate Christianity, but ended being self-limited because it is so close to human nature and so easy to embrace. It consumed certain number of people and then stopped. But that's been the case ever since Christ left. What we have now are only regurgitated heresies of the past.