Is selling insurance a bad business in Buddhism?

If you learn Buddhism, you will be kind to others. If you don't do what you quit, you don't do it. Is it heinous to sell insurance? It shouldn't count. At most, some types of insurance involve some, so just don't do those. Generally speaking, selling insurance is a way to serve all beings, not a bad business. Of course, there are also problems in it, which depends on everyone.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.