Is that not a Christian rather than liberal view?
In a way yes — but even the loving, giving Christian faith has sense built in, such as the importance of defending your fellows from attack. Jesus did recommend a sword or two be carried by the disciples once he and his supernatural direct protective presence was gone. Not to go on rampages, or to slay infidels, but to stop common criminals from surprising and freely ravaging the group. If individual Christians knowing choose to turn the other cheek for some good reason, wonderful (and even then don’t cast pearls to pigs) but they can’t choose that for other Christians who know nothing of what is going on.
Jesus said to turn the other cheek if slapped. A slap is an insult, not an attack intended to do serious damage. Jesus said we should react peaceably when insulted.
He never said we should not defend ourselves and other innocents against attack by evil men.
As has been pointed out before, what do you think Christ would have done had men physically attacked the children he invited to sit at his feet?
WWJD?