Stochastic just means random, the opposite of deterministic. For example, in a deterministic process, A always leads to B and never leads to C. In a stochastic process, A leads to B 70% of the time and leads to C 30% of the time. You can't predict any the outcome of any single instance, but you can reasonably infer that if you do A 100 times, you will get about 70 Bs and about 30 Cs. Then you can do other calculations based on the variance, for example determine the probability of getting less than 60 Bs and over 40 Cs. Stochastic processes are meaningful if there is actual data.
Nuclear decay is a natural stochastic process. The Black-Scholes equation attempts to model financial derivatives stochastically. Can hate speech be "stochastic" terrorism? I suppose technically they are correct as you can say something that somehow leads to a certain number of people becoming terrorists. But also, If I cut someone off in traffic, that could inadvertently be "stochastic" terrorism if the other driver goes crazy and starts killing people. A butterfly flapping it's wings in the Pacific Ocean could create terrorists in Atlanta or Cleveland. Unless they actually have data or demonstrated some sort of concrete causal relationship, the idea of "stochastic" terrorism is meaningless.
