They, along with others still in line feel cheated by the people entering illegally / abusing the asylum claim systems. If you're escaping a bad situation in a central or southern American country, and then pass through 4-5 countries to get here, you're not seeking asylum, you're an economic migrant no different from immigrants from India, China, etc all seeking a better life.
No other developed country would or should allow people to illegally enter and skip the legal process.