This.
I got involved in an opera thing that had been commissioned to mark the start of WW1. I played the part of the "recruiting officer", and had to play a scene in which we'd gone to a village to get people to sign up. The recruiting officer was not a pleasant character - there was lots of moral blackmail, misogyny, and patronising stuff, all aimed at getting young men signed up.
I felt uncomfortable, because it seemed to me inconceivable that anyone would have been quite so blatantly manipulative about getting people to sign up to fight, so I did some research. And what I learned was that, far from being a caricature of the situation, it was, if anything, a toned down version of what went on. Huge amounts of emotional blackmail were applied, both by the military themselves, but by society at large. People bought into this, to the extent that apparently fit young men who hadn't signed up (this was prior to conscription, which didn't happen until 1916) were often given a hard time in the street.
The "Pal's battalions", similarly, weren't as simple as they're now presented - people were put under considerable pressure to join up with their workmates, neighbours, or friends. We might see the idea of a bunch of mates going off to fight together as noble and laudable, and it was certainly presented that way, but a lot of people joined up because they didn't feel that not joining up was an option.
Furthermore, the stories we hear of young people so fired up with patriotic fervour that they signed up with false ages also tell quite a few tales - a lot of that went on with a nod and a wink from the authorities, who were knowingly signing up 14 year olds to go and fight in the horror of the trenches. Any sense of moral rectitude had taken second place behind the goal of getting as many people onto the battlefield by whatever means possible, whether they were old enough or genuinely willing to volunteer - so long as they gave the impression of volunteering, that was good enough.
And that's before we get into economic conscription, or the rights and wrongs of statutory conscription.