IKEA promotes itself as ethical and clean. Selling solar panels is part of this marketing buzz that IKEA has created. This submission is a direct result of IKEA marketing.
Some people may not want to buy from a company engaged in such vigorous tax avoidance.
Some people may not want to re-elect a government which creates such lucrative tax avoidance incentives ... including by confiscating so much of income as to necessitate aggressive leveraging of such deductions.
Sure, Ikea isn't doing it out of sheer altruism. They're doing it because, under the laws they're subject to, it's a sensible business strategy.
Some people may not want to buy from a company engaged in such vigorous tax avoidance.