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.’