If your vehicle needs more space to come to a stop, don’t follow the vehicle in front of you by less than that space.
If you rear end someone because they emergency breaked (for any reason, good or bad), it’s almost always your fault. Exceptions for if your breaks fail in that moment or if someone else rear ends you into the vehicle in front of you.
Added benefits of not following so closely on a motorcycle: less exhaust in your face, more distance from rocks lifted by tires, more time to assess and act on surprises ahead, less likely to be rear ended yourself because you can stop slower.