This arguement fails on many levels. For instance, we have logic reversal:"if P then Q - if God is love" gets turned into "Q therefore P - love cannot exist without God". Might as well say "If space creatures were kidnapping people and examining them, the space creatures would erase the memories of the people they examined, giving them amnesia. Therefore, anybody who suffers from amnesia has been kidnapped by space creatures".
You're also ignoring all of the most reasonable explanations. This makes the desired (perhaps unreasonable) explanation into the only one. For example: "My plants were perfectly fine yesterday. Today, many buds are missing. Clearly, my grow was visited by fairies."