More than one person is to blame. For example, within every single corporation, decisions are often made by committee and even when it’s a unilateral decision, others can speak out if it’s an immoral one.
Yes obviously companies being irresponsible is the biggest problem, but sitting on our hands at home because we can’t make as much of a difference adds up and I’m sick of seeing it excused. Your argument will be used as an excuse to be lazy more often than not.