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If it has been excessively dry, I would make sure just to give it a little water now and then. Although they are very tolerant of many conditions, and will usually recover from any damage done, often becoming invasive in many areas, they will appreciate staying slightly moist.

This article will help you on the care of bamboo: https://www.gardeningknowhow.com/ornamental/foliage/bamboo/caring-for-bamboo-plants-in-your-garden.htm

You may cut bamboo shoots, but don't cut all. That is the source of new growth with young vital energy.
From the photo it appears that your plants have poor growing conditions with only a small strip of soil, which appears dry and compacted.
Increase the open soil surface area if possible; leave the leaf litter as a natural mulch to insulate and retain soil moisture. Provide more water during the dry season. Fertilize. The better growing conditions that you can create and maintain soil and water management, the healhier your bamboo plants will be.

I hate to get in the middle of a husband/wife controversy, but for the sake of protecting the Washington forest from invasive bamboo -- You're intuition is right on, and he is, shall we say - not adequately informed. Don't dump the bamboo fragments in the forest, burn it, or send it to the landfill.

This article will help you with care.
Light conditions, fresh water and fertilizing will likely help.

https://www.gardeningknowhow.com/houseplants/lucky-bamboo/growing-lucky-bamboo-indoor.htm

That is unfortunate! On the upside, your bamboo will eventually grow back. It is a relative of common yard grasses, and tends to grow as such. Many of those cut shoots will re-sprout closer to the top where it is cut. Along with more shoots that form from the ground. What he has done to prune them will only make them thicker, and grow back more vigorously. Bamboo can tend to be a little invasive. Here is a link for more information on the plant: https://www.gardeningknowhow.com/ornamental/foliage/bamboo/caring-for-bamboo-plants-in-your-garden.htm

There are a few other remedies you can try. These inlude: garclic oil, clove oil, lavender oil, wettable sulfur, rosemary oil, or even cinnamon. One of these methods, or more, will help.