There's nothing wrong with discernment. I always say to go with your intuition when dealing with the unfamiliar.

But I, too, also feel the OP is right. You can't make a blanket statement about ETs any more than you can make a blanket statement about humans. There's good, bad, and in between in all and any population of beings.
As far as abductions go, however, you'll be surprised upon further research. Once our fear trigger is activated, rational thinking goes out the door, and situations are perceived much differently than they really are. Not all abductions are done with harmful intentions. I'd even go as far as to say the majority of them are not.