Mining on personal/home computer is already dead,you cant even earn 10%of the price of your processor before it dies due to heavy load and high temperature result from mining apps.Its not advisable to do mining on your home pc forget about mining
But why? For example, I mine on my processor some new projects and some of these projects later became famous and brought me income.
I agree with you. You can even use old computers for mining new coins. And I don't know what to do to burn the cpu. Probably not watching the cooling system at all. Work with a broken fan and completely dirty cooling?