No, that's not really the main reason. The main reason is that almost every modern Western political ideology is either a development from 18th Century liberali

No, that's not really the main reason. The main reason is that almost every modern Western political ideology is either a development from 18th Century liberalism [the more common case] or a reactionary response against it or some subset of its descendants [excluding the overlap, the less common case], and some are both descendants of 18th Century liberalism and reactions against other descendants.) As a result, most ideologies in the West have some claim to the name “liberalism” and an even larger majority have deep seated opposition to one or more things with an association with that name.