Of course not. But the constitution of the Federal Republic of Germany (since 1949) has been a success by most accounts.

Of course there has been a lot of turmoil, war and political change in Europe in the past. And my own country was the main aggressor in WW1 and WW2 . Terrible. But it would be wrong to somehow blame this on the current European constitutions, when they were not in place at the time.