As of the question of the topic, i would surely do my best to convince the person i suspect will commit a crime to not do so, but in the end, i have no real proof that the person in question will commit a crime; As the law puts it, he is innocent till proven guilty.
But i want to point out some issues with that study you just linked;
First of all, all the research was done in just one subject, that is
far from acceptable for an actual study to pinpoint the causes of bestiality in the general population.
Second, the subject is described as "A 18-year old unmarried, non-literate male of low socioeconomic status" with
average indian IQ and a historic of sexual abuse on his childhood and alcoholism as a teenager.
The article also mentions that this guy father and brother practiced domestic violence against their respective wife's, a thing this guy witnessed as a child.
I dont know man, i think this guy has some seriously big issues, it's no wonder he's mentally unstable, don't colour me surprise if he also turns into a pedo in the future, his mental health must be crawling down the drain.
I believe a real study with serious research on multiple subjects is necessary to actually find out the cause of bestiality.
I also want to point out that the analysis of the drawings is hilarious.