If the objective is specifically to prevent such large scale sexual attacks in the UK, rather than a more general one of holding onto our current rights and freedoms, maybe we need to insert something like this between sentence 1 and 2, so that the original sentence 2 becomes a general final comment.
'We urge the government to debate this issue and put in place measures to ensure that the risk of similar attacks in the UK is minimised.'
The onus is then on the government to identify the appropriate measures.