Advice on thinning/pinching bean sprouts

[limabean]

I'm growing a square-foot garden, with 14 squares of various flowers and vegetables/herbs. 

The template I used said, for the bush beans, to poke 9 holes within 1 square foot, and to put 2 seeds per hole to ensure that at least 1 would germinate. Well, all 18 seeds germinated and they're growing like crazy! They sprouted 3 days ago and they're growing over an inch per day. Should I pinch them so that there's only 1 plant per hole? I'm worried that they'll get really bushy and crowd out the plants around them. Also, I know they're bush beans, but should I still give them something to climb so that maybe they'll grow more vertically instead of encroaching on the plants around them? 

[lunita1]

Just snip off plants at the base with scissors (or pinch with your fingers) leaving one per hole.  They don't need any support.  Some varieties are "half-runner" and will climb a tiny bit if you provide support, but most aren't.  They are usually just about knee-high.