I personally think, that if we live on planet Earth. Then why shouldn't there be life on other planets accustomed to their surroundings? Like Neytiri from the movie "Avatar", the alien creatures are tall so they can climb and fight, they have different eyes to see different things coming towards them. Their nosed allow more oxygen in, and their lungs are made for the air on Pandora. The animals are also custom, the thanator has large claws to cut through the giant trees on Pandora, and kill the food they need to survive.
If us humans think we are the only living beings in our universe, then (Like Jiirani said) we are selfish. What if the aliens or other life forms just act mean because it's the way of their people, or they destroy because it's what they were made to do. Our scientist don't know much about our universe. They have yet to discover new being and planets. One day, they are going to find a planet that have life forms, and beings habiting the world and are accustom to their surroundings.
Now with ghost and other paranormal studies. It could be true, that ghost are real. Some are caught on camera and video or maybe even audio. Us humans don't have the eyes to see the ghosts with our own two eyes. Sometimes we catch them on thermal imaging, which is a way of seeing. People of many centuries have had encounters with ghost and paranormal activities. What's it to the scientist to say 'Ghost are not real, get over it". They have no idea what they are talking about!
Some ghost's are attached to an item of theirs or a family member they love. Other people may not be able to see them, but the owners of their family members item or them in general, might be able to see them. Everything is in the eye of the beholder!
I wrote a lot. Maybe to much, but I love persuasive. ;3