A Europe with an artificially un-mighty Germany in it was even less safe. The story from unification to surrender in 1945 was one of Germany finding its rightful place as a major european power and economy.
Italian nationalism was pretty destabilising, as were the artificial nation states imposed at Versailles that created such easy prey for Hitler.
the problem is that we never wanted this to be our problem. We only ever got dragged in to sort it out and, from day to day, wanted nothing to do with them. We still dont.
Arguably the right thing to do was never join. Or at the very least, to leave before Maastricht.