Supposing, of course, that this is an ESL problem, I'd expect the original Dutch sentence to have used the Dutch word 'men', which means the same as the English

Supposing, of course, that this is an ESL problem, I'd expect the original Dutch sentence to have used the Dutch word 'men', which means the same as the English 'one' as in "one must not ...", or the 'man' in 'mankind'.