Here are some more dogmatic sentences and their better equivalents:
Some people believe that…
…it is ridiculous for students to have to take part in sports
Better: ‘…it is not worthwhile for students to have to take part in sports.’
…it is stupid to abolish passports
Better: ‘…it is inadvisable to abolish passports.’
…it is a waste of time educating people in prison
Better: ‘…there is limited value in educating people in prison.’
…it is idiotic for governments to spend money on the arts
Better: ‘It is not wise for governments to spend money on the arts.’