What are you trying to achieve? If the recipe calls for that amount of sugar...to make that beer, then use it.
To that recipe, that kit, that is EXACTLY the correct amount of sugar to achieve the goal that the creator of the recipe intended.
Do you think the person who created a recipe or the company that chose to produce and market that recipe was a MORON because he/they used sugar?
That's actually another one of those brewer's myths that new brewer's tend to repeat over and over like canon, without full understanding what they're talking about.
Too much sugar, in a recipe can give off off flavors, or make a beer cidery, but we're talking about someone who wants to bump up the alcohol on his 6 pounds of extract beer by adding another 6 pounds of table sugar to it.
That whole thing about not adding sugar or else you make "cidery" beer is one of those little "chestnuts" that noobs repeat without thinking deeper about it. When we talk about it being a bad thing, is when the ration of sugar to malt quite high, like frat boys trying to bump up their coopers can...yeah that's a bad thing...but we're not talking about that in most cases, we're talking about an acceptable brewing process for many styles of beer...
I mean do you like Belgian beers? Are they "cidery?" Are they crappy tasting because of the simple sugars that are added? If you like them, that's how they achieved the beer you like.
Belgian beers are a style that are supposed to have simple sugars in it. It raises the abv, but it also cuts down on some of the body, promotes the formation of certain flavors and helps dry the beer out.
Adding sugars traditionally are a way of upping the ABV without boosting the body. They also can thin out a heavier bodied beer. And dry it out.
If you are trying to make a high gravity beer if you used all grain you'd have a thick and heavy beer.
The easiest comparison to make is the difference between a Barleywine and a Belgian Dark Strong Ale. They are pretty close in color, ibus and gravity, but since the Belgian beer replaces some of the grain with sugars it's a thinner, more refreshing finish....where the barleywine is almost like a liqueur.
A pound or two isn't going to affect the beer in a negative way, especially if the recipe calls for. Even a cooper's which people want to deride, or some others suggest replacing with malt extract, is really meant to have exactly the amount of sugar the recipe might call for. But if you willy nilly add a couple more pounds to it, that's another story.
It's about balance in a recipe, the correct amount of sugar in a recipe is fine, and often serves an important purpose.
Please don't fall into that trap of misunderstanding and repeating that errant idea. Sugar is not the enemy, especially in a Belgian...Too much sugar, especially if it's done SOLEY to bump up the gravity is bad. But 99% of the time, that's NOT the intended purpose of adding sugar.
If you didn't want to brew "that beer" then why did you buy that kit, and not one that had heavier body?