Since when was the Heritage Foundation, a US conservative think tank, the 'alt-right'? Surely it is a mainstream right organisation by US standards.
People need to stop labelling everything marginally to the right of Pol Pot 'alt-right' it has become a meaningless term. If you label everything you disagree with 'extremist' then when real extremists show up no one will pay you any mind. You* will become the boy who cried wolf.
This is particularly important on this issue as trans privilege activists are targeting our children. This is an issue where the actual far right could and, if nobody else stands against trans ideology, will gain ground. Most people want their children protected from this nonsense. At present vast swathes of the public have no idea what is going on but they will find out eventually and when they do there had better be a moderate body politic for them to turn to because if the far right are the only group who will protect children the far right will get the votes. People have a limit beyond which they won't be pushed.
(* you is the generic you, not aimed at you personally OP)