With the regards the position that we should adopt legislation on the basis this exists in other countries.
By way of example,
(from Wikipedia)
The only countries with permissive gun legislation are: Albania, Austria, Chad, Republic of Congo, Honduras, Micronesia, Namibia, Nigeria, Pakistan, Philippines, Senegal, Tanzania, the United States, Yemen and Zambia, although several other countries like Canada and the Czech Republic, despite theoretically being restrictive, are shall-issue countries.
Yet despite Donald Trump's recent suggestion, we don't have permissive gun laws in the UK.
NB I am illustrating a principle, not comparing those advocating for for transgender rights to those who support the NRA!