We can't avoid all problems, so the general strategy we need is to get more knowledge so we can be better at solving unforeseen problems.

And it's not reasonable to fear the unknown on principle. Being "conservative" by avoiding an advance doesn't make sense in isolation. It might cause a problem. It also might solve one. We don't know that. We do know technology is useful.

But "gung ho" doesn't sound right. Sometimes we have a substantive idea about a way an upcoming technology could be dangerous. In that case we should respect and consider that foresight, not just charge forward anyway.

BTW David Deutsch's TED talk touches on this.