They as well could.
They choose to profit from producing the stuff.
They could as well use glass as they did for decades, or sell reusable bottles and refill those. They choose to operate in countries without proper waste management knowing where that trash will end up, and are operating there anyway.
They know the damage they're causing, they've been influencing policies for decades with "reuse, recycle, reduce", even if they knew that recycling doesn't work and that just 8% of plastic ever made was recycled.
The (microplasti) pollution problem is huge, and damage they're causing is immense.
They are the (major) symptom of the problem that needs solving.
Yes, governments are among those responsible.
https://www.nature.com/articles/s41598-020-61146-4
Microplastics generated when opening plastic packaging
https://www.newscientist.com/article/2237900-just-opening-a-...
Just opening a plastic bottle can release thousands of microplastics
https://www.theguardian.com/environment/2018/mar/15/micropla...
WHO launches health review after microplastics found in 90% of bottled water This article is more than 5 years old
Researchers find levels of plastic fibres in popular bottled water brands could be twice as high as those found in tap water
Sending plastic bottles to recycling is pointless and doesn't work, anywhere.