Reaching out to some group doesn't mean not reaching out to other groups, or espousing their views. Also reaching out to right wingers is emphasised because it is assumed that you are already reaching out to the rest.

Although I do think that on this site it is often overemphasized and there's people who for some reason think conservatives are easier to get on board than libs or whatever which is just obviously and demonstrably untrue. Also expending a lot of time on some people is just a waste since they're simply lost causes. But ideally people should at least make an attempt to talk to everyone, regardless of how shit their beliefs are, ESPECIALLY when they share material interest in some circumstance. For instance, when trying to get people on board with a strike, you try to get everyone on board, even the gross asshole who hates your guts, because it's actually something that affects him. But there's no point wasting your energy trying to convince said gross asshole about the importance of fighting against the patriarchy or trying to turn him into a socialist or whatever. It's not gonna happen and it is just a waste. You're much better off telling him to fuck off every time he is being gross.