I'm not saying they didn't need a kicker, just that it was completely unnecessary (and detrimental) to waste a first-round pick on one. Plenty of decent kickers can be found in the lower rounds. .....and every last one of them were/are more stable mentally than ole Sebastian.
Your first round pick is generally used to either fix a glaring problem in your team or get somebody to train up to replace an aging player in a year or two. The rest of the team was solid and still pretty young, but their kicking sucked. I don't disagree that Sebastian was the wrong pick, but I think given the state of the team at that point a kicker is what they needed most and that's what you should use the first round for.