OP, few men are willing to aim high and have standards in the name of convenience and the fear of being alone. I have friends that tolerate their annoying and unattractive girl friends, because they lack confidence to do any better. They have access to coochie that has been hard to get in the past, so they do not want to rock the boat and lose what little they actually have, even if it really does not make their life any better. To them, being a beta is less shameful than being an incel.
I also have friends with attractive girlfriends. Most do not do any "plate spinning," so they are often in a constant state of paranoia of losing their "holy grail" of a female and often become a slave to her as a result. Ironically, this actually often causes them to lose them anyway, since women interpret such paranoia as a sign of low-value. I have fallen into this trap myself more times, than I should've.
Let your friends learn from experience. When they eventually get burned, be supportive and caring. Saying things like "I told you so, you stupid blue-pilled beta." to them will only cause them to dig their heels in and repeat the same idiocy that they were previously engaged in. Ultimately, they will regard you as an annoying zealot that does not want people to be happy, regardless of how helpful your advice may be.