Translate the following English sentence to French:
"I must ask this, however: do the statements by those currently in power in Europe, who are, in the majority, Socialists, and who, for various years have headed the governments of their respective countries, not above all reveal more about their shortcomings and the serious failures of the European development model which they have been promoting?"
Question : les déclarations des responsables européens actuels, majoritairement socialistes et aux affaires depuis plusieurs années, ne révèlent-elles pas surtout leurs incapacités et les graves failles du modèle européen de développement qu'ils ont promu ?