Anyone can have good ideas you should adopt. I get good ideas from people who oppose everything I stand for all the time, because most people are libertarian in their personal lives- otherwise they would be dead. This means they already have libertarian ideas bouncing around inside their skulls. Sometimes those ideas will become public. When they do, grab them.
Any idea which advocates initiation of force or theft is not a good idea. The advocate may believe it's "necessary", or "pragmatic", or some other dishonest justification, but it still isn't a good idea. And it's an anti-libertarian idea.
So, even if the most despicable statist you have ever heard of comes up with a good idea, accept it. If it's good, it's libertarian.