Perhaps!
I think that - for me - that wouldn't be a problem.
First of all, I am more likely to use a random generator when I have very *few* preconceptions (and that's generally where "apocalypse fuel" would be the most useful), so that's not a detractor for me. Second, if I am using this in a context where the "Colour" could clash with what I already have, it would be very easy to simply ignore it.
Frankly, however, "reimagining" some bit of apocalyptica to fit with the mood and style of what I already have going on would be an *excellent* and fruitful exercise - exactly what I come to random generators for.
Therefore, I would see that as more of a feature than a bug. If what I came for was "A rival gang threatens their turf", but what I got instead was "A rival gang, carrying stop signs as makeshift shields, threatens their turf", it's VERY easy to ignore the "shields", and just take the part that was useful to me ("A rival gang [...] threatens their turf").
(Even more fun, though, perhaps thinking about how stop sign shields *could* fit this situation or setting would prompt me into unexpected territory and lead me to discover or invent something really new; something I wouldn't have thought of trying on my own. That, to me, is perhaps 2/3 of what I come to a random generator for - to prompt new ideas.)