Gromwakh is looking after his own hide and those of his mates.
Their objective is to suffer few if any losses and return to the Mt. Gundabad region. They were conscripted for use in this foray against the Golden Wood and feel no loyalty to anyone but themselves.
What's in it for them? Nothing from Thrákmazh and his lot - he's already done one of them in. They feel the the Southrons are just as untrustworthy. The Orcs, they know, will be thrown into the frontal asaults and most of them killed. Their chances of getting home after this battle are slim, and they can see themselves being dragged off to some other battle they really have no stake in.
The Elves are an unknown quantity to them. They've heard stories of course, but never met one in the passages beneath the mountains. Getting back to the northern Misty Mountains would be easier if they had safe passage guaranteed either through Lorien or up through Mirkwood.
This is not to say they wouldn't kill any Elves who threatened them . . . or for that matter take a whack at any Southrons, Uruks, or other Orcs who stood in the way of their survival.
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If more of us valued food and cheer and song above hoarded gold, it would be a merrier world – J.R.R. Tolkien
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