Why have they radicalizing their children to such an extent?
Bosniaks and Croats don't carry on that way
You should read about this then:
Croat–Bosniak War - Wikipedia
The second biggest city in the country is still segregated, and the Mostar division is between Croats and Bosniaks.
Arguably the greatest monument of the country, the Old Bridge in Mostar, was destroyed in this war, to cut the connection between Croats and Bosniaks in this war.
Stari Most - WikipediaAfter the destruction of the Stari Most, a spokesman for the Croats said that they deliberately destroyed it, because it was of strategic importance.[15] Academics have argued that the bridge held little strategic value and that its shelling was an example of deliberate cultural property destruction. Given that mosques, synagogues, and churches in Mostar were in proximity, the Old Bridge was targeted for the symbolic significance it served in connecting diverse communities.
Serbs have committed a genocide in Srebrenica, but this does not mean Croats and Bosniaks were not radicalized in the other places of the country.
(There was even a bloody internal Bosniak war, between the forces of the most popular politician and the official president.
The war in Bosnia and Herzegovina was sad, bloody and complex, as civil wars often are...
And sadly all sides were very radicalized 3 decades ago.)
The situation has improved greatly since the war, unlike in Kosovo for example.
(This thread actually picked the wrong place for possible problems.)
In Bosnia and Herzegovina the radicalization of all sides lowers with time: economic, cultural and sport connections between Serbs and Croats and Bosniaks have practically returned to pre-war levels.
Unlike in Kosovo.
The ethnic resentment is still visible in remaining segregation of practically every city (Banja Luka is Serb, Tuzla is Bosniaks, and Široki Brijeg is Croat)... school systems remains divided in three parts...
In the capital the situation is slowly improving, and in time it is bound to improve in other places, but this cannot be done artificially from abroad...