Labour proposes to continue taking Britain out of the EU but preserve almost all of the EU's laws.

This might perhaps avoid most of the harm that the Tories will end up doing. It will also avoid nearly all the possible good of leaving the EU: eliminating plutocratic laws that give business too much power and oppress countries such as Greece. However, the Tories don't want to eliminate those laws anyway -- quite the contrary, they are looking for an excuse to make those worse.