the moon landing program was the first time human landed on another space object, ever landing was successfull, the apollo 13 mission with malfunction have also return to earth safely. the are spectacular success of technology that does not exist just a few years ago. for a alien spaceship that are capable of intergalatic travel with faster than light speed it is fair to assume that they have hundred or even thousand of years of experience in doing space travel. i would have expect their space ship to be able to land on any planet without problem.

also for all the mission that suffer failure at landing like the shuttle and the mars robot, they are burn out before they reach the ground, have you seen any case that the space vehicle that are intact when crash landed?

now lets assume there are alien that crash landed on earth, which is a very small possibility, and the spaceship is largely intact after it hit the group, what would the government be able to gain from studying the spaceship, its technology that are develop for tens of thousand of year seperate from earth technology development, is there any possibility to adapt their technology? ore can we even be able to detect the alien ship and the alien species?

If u think about it, a creature that is able to travel across the universe, it means their technology maybe thousands or maybe millions of years more advance than us.
So, to them, we are like ants. For a creature trying to take over some creatures as sad as ants, that particular alien must suck real bad enough to make it want to take over civilization as sad as ants. It must be some low self-esteem alien or something