Virtue Signalling Hard
Considering that the LGBT community represents about 1 to 3% of Canada, (5% is very generous) they are certainly a loud group that gets lots of support from PM TruDoh.
https://www.pinknews.co.uk/2018/06/21/justin-trudeau-lgbt-pride-flag-parliament-hill/
It does not seem logical from a from a partisan votes scenario as the LGBT community represents such a small amount of Canadian population.
What's with that light blue and light pink flag? Trans flag apparently… Although, light blue and pink are commonly associated with children….
https://www.fotolip.com/trans-flag-5275.html
https://uncloseted.wordpress.com/2013/06/03/lgbt-pride-flags-and-symbols/