Good apologetics is rooted in a love of people, taking them and their questions seriously, instead of just preaching at them and assuming its their fault if they don't understand.
Another reason apologetics is so important, is because it lays the groundwork for theology, and good theology matters. If we say that there are no good reasons for Christian faith, or that Christianity really is just a bit absurd and nonsensical, then how do we justify trying to say anything reasonable about God? Especially considering how non-believers might grow into the faith if they are converted, good apologetics sets a precedent for reason, study and asking good questions that is integral to good theology, preaching and discipleship.
... That said, apologetics is not everything. While some Christians can get a bad reputation for making no sesne at all, some Christians can be so wrapped up in apologetics that rather than being helpful to outsiders, they come across as smug, more-clever-than-thou Christians who are only interested in winning arguments. They may also be missing out on the more intimate and experiential sides of faith, or the truth that not all of faith can be explained with mere logic and reason.
God has given us a heart and a soul as well as a mind. They are all important aspects of what it means to be human, and all are essential in knowing God too.