There have not many benefits of the ISS

There have not been several useful applications of the expensive vessel despite initial claims. Most experiments are useful only due to its zero gravity state, which although expensive can be replicated on Earth.

Space exploration is a long term investment

Space exploration is a long term investment, not an instantly gratifying machine 

Space exploration is a long term investment

It will give long term benefits, not instant gratification

The direct benefits of outer orbit exploration have been few

The direct benefits of outer orbit exploration have been few. No expediton has directly increased life for people.

Space exploration provides the only viable alternative to human survival on earth

When thinking of the human species in terms of millions of years, life on Earth increasingly becomes unlikely and space exploration provides the only viable alternative.

The International Space Station cost 150 billion USD

The International Space Station costed more than the entire economy of several countries. Millions more are spent in maintenance. This money could have been very useful elsewhere.

Space exploration may pave the way for survival on other planets

To figth problems that are being faced on Earth such as overpopulation, space settlements are a viable solution.

The benefits of space exploration will be felt heavily in the long term and will help further mankind

Space exploration is furthering a path for the future of mankind. All investments made today will be felt a thousand times over in the future.

The argument that billions spent on space exploration could be used elsewhere is flawed as space exploration is an investment, which could help solve several other problems down the line