The OP doesn't want to enable the bad uses of Tor, nor do they want to get into legal trouble for it. It's demonstrated that by running a Tor exit node, you are at a high risk of the former and at least some risk for the latter. Both carry significant costs. By not running a Tor exit node, you eliminate these risks to yourself.

The risk that your neighbor will use your knife to kill someone is far lower by comparison. Additionally, the risk that there is a legal threat should they choose to do so is also quite low.