Since Captain Obvious is not available today, I will try to answer this rhetorical question.
Catholicism today works by example, not by coercion or intimidation.
Murder, intimidation and coercion are the most effective tools today to achieve any sort of effect, positive or otherwise. It is the worldwide standard tool.
Q.E.D.
When Italy had been Catholic for about 500 years, it was overrun by barbarians and sank into the dark ages.