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The Church likes authority. It's much easier to sign a concordat with a dictator --  then  there's no worry that a democratic legislature might refuse to ratify it. This is why concordats are so often made with dictators: on Concordat Watch you can find ones concluded with Hitler, Mussolini, Franco, Duvalier, Trujillo and others...

In 2003 the Czech parliament refused to ratify the concordat, but the Vatican has won over the Czech Culture Ministry which is now preparing to push it through.

Germany retains its concordat with Hitler, even though Italy has got rid of the Mussolini concordat, Spain has replaced the Franco concordat and Portugual has scrapped the concordat made with Salazar. The Vatican wouldn't likely receive such favourable terms if it were replaced, and Germany, of course, does not insist...

These church-state accords give the Church massive state subsidies and other privileges. They can effectively force liberal Catholics to observe orthodoxy, and can disadvantage non-Catholics, as well.

This concordat with Nazi Germany was negotiated by Cardinal Pacelli, who in 1939 became Pius XII. It is still substantially in place, although the other concordats made with early 20th-century Fascist leaders have been revised or completely replaced. 

A concordat was made especially for “the basilica in the bush”. The church is modelled on the pope's cathedral, but was planned to top it. The concordat removes money from this desperately poor country for the upkeep of the huge and empty basilica.