The question of whether disposing of caught alive cockroaches using a vacuum cleaner outside in a green space is humane or a bad idea is a complex one and depends on various factors.
From an ethical standpoint, some people may consider using a vacuum cleaner to capture and release cockroaches into the wild as a more humane option compared to killing them outright. Releasing them into a green space would allow them to continue their natural life cycle and potentially find food and shelter. However, it's essential to consider whether the particular green space is their natural habitat or if it might be an invasive species concern.
On the other hand, releasing non-native or invasive species into a new environment can cause ecological imbalances and harm local ecosystems. If the cockroaches are not native to the area, releasing them could lead to negative consequences for the local flora and fauna, potentially harming other species and disrupting the ecosystem.
If you are dealing with multiple cockroaches, it's important to consider the severity of the infestation and whether it poses a threat to your living space or health. In some cases, pest control may be necessary to prevent the spread of disease or damage to property. If you are unsure about the best course of action, it is advisable to consult with a pest control professional who can assess the situation and recommend appropriate and environmentally responsible measures.
Ultimately, the most humane approach will depend on the specific circumstances, the species of cockroach involved, and the impact they may have on the environment. When dealing with pests, it's crucial to strike a balance between humane treatment and ecological responsibility.