There's a world of difference between "we can't be sure that other companies won't backdoor our systems" and "We know for a fact that lenovo has done it multiple times and repeatedly lied to customers about it when found out and even once released a patch which they claimed fixed the problem but which actually still left their customers vulnerable."

All people are capable of being untrustworthy, but that doesn't make all people the same as those who have already demonstrated that they are.