Other human beings are a subset of your environment. So you may ask "How can I improve my perception of my environment?". This is (only) 1 of the many benefits of the experience you live through when you ingest the substance LSD: Handled the right way, you can experience the most awe inspiring moment of your life, you can not just see beauty, but live it, be immersed by it and be a part of it. You're likely to ask yourself over and over "why was this hidden from me all those years?". You can literally feel your entire environment in a very positive, magic and vibrant way (hint: find yourself an isolated place in nature that you like and listen to your favorite music). And part of this feeling is very likely to stay with you, after the experience. It may be subtle, but a very subtle positive change in the way you feel and perceive your environment can change your thoughts dramatically and therefor your general behavior. You can become very positive.
This is why it's completely wrong for humanity to keep this substance illegal. This substance can lead to a whole new appreciation for our Planet, the Universe and for the human beings around us.
(Of course, "follow the money" seems to apply here as well, when I think how this molecule seems to be able to replace heavy side-effect ridden anti-depressant therapies which are of course one gigantic cash cow for the pharma industry.)
Note: It is absolutely mandatory to educate oneself about the substance as much as possible beforehand and to prepare one's experience by respecting all the rules that apply (and: there are a couple of medical conditions which make the substance very risky for you, should you suffer from one of them knowingly or unknowingly).