Croatia is overall very safe country to travel to. It has never been on a pick from terrorist groups and overall crime rate is very low. Croatian people are friendly and used to tourists so anyone travelling to Croatia will and should feel very comfortable. Luckily, Croatia was not affected by refugee crisis in Europe and very few people asked to reside in Croatia but they rather picked other European countries such as UK, Germany, Scandinavian countries, Italy and other.
Croatia's Security and Intelligence Agency describes the country as stable although it warns that terrorist attacks in Europe have made the situation more complex in Europe and all the countries raised alerts for possible attacks. Luckily for Croatia, most of the high-risk areas do not include Croatia.