The motive for the statement appears to be that Croatian President Zoran Milanovic does not want his citizens pressured into taking vaccines they do not want and perhaps a protest against media-generated panic. He does not mention harms from the vaccines themselves.
Source:
https://www.europereloaded.com/president-of-croatia-exposes-media-for-spreading-panic-about-covid-19-says-no-more-vaccination-allowed-in-his-country/.
News.