My best guess as to why this was included is because most state, local and fed officers all have significant personal owned weapons themselves and are just as concerned about loosing them as we are.
This is an effort to encourage current LEOs to enforce the new restrictions because they have no incentive to do so if it will mean loosing their own guns.
I am a retired LEO and I do not think I have anymore rights than an average citizen. This is the standard dem playbook. Divide and concur, divide the law abiding citizens from the LEOs and military. Because if they are united against government tyranny the Marxists can not achieve their goals.
Look for the move towards promoting the “oathkeepers” oath for LEOs who are working at this time with the current military.