What's the very worst that can happen?

[Anne M.]

If you buy and rent, what's the very worst that can happen and can insurance always protect you from that?

Can a tenant sue you for something where you have some sort of personal liability? Living out of the country, being subpoenaed to a US court would be a major hassle for me, for example. 

Even worse, can end up owing someone millions in compensation or going to jail? 

I understand monetary/financial risks. Trying to find out what kind of risks exist beyond that.