Was it a Cimmerian Berserker purge? This purge tends to spawn on base much more than others in my experience.
Now that you know about this Purges ability to spawn in or on your base, it should be easier to defend it. The Purge is a learning experience, and each one can throw new challenges your way. It can destroy your base if you aren’t familiar with it’s complexities. As someone who gets the Purge around once a week (I’ve been playing for over 5 years) the Purge is very exciting and keeps me playing the game. Don’t give up just yet, rebuilding to handle what the game throws your way can be very fun! I’m sure other purges will slowly walk up to your base, but some will almost always spawn right on it.
Frost Giant, Yeti, Cimmerian Beast-Tamers are all Purges much more likely to do a little stroll up to your base 
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