Translate the following English sentence to French:
"Firstly, these are immensely complicated and very sensitive legal questions which are at issue and, to my mind, the proposal entails some risks to legal certainty, which have not been fully realised. This is in itself sufficient reason for us to deny our support."
Il s'agit, primo, d'une question juridique terriblement complexe et très sensible, et la proposition présente, à mes yeux, certains risques pour la sécurité juridique dont il n'a pas été pris conscience.