this is such a loaded question please post some hand examples with your logic behind it for us to be able to help you in a meaningful waywhen have middle pair in tourment,do I need to raise to protect the middle pair ?and there is more than 2 people such as 3 people in the flop.
yes is tru but depends if you have a stack as small as you can make a raise to see what reaction they have otherit depends the flop,the pot,stacks and your position