Why hsving too many migrants is bad for the country?

Why too many migrants are not good:
1) They will compete for jobs with citizens.
2) They will suppress wages for a long time.
3) They will take away important skills.
4) They create tensions such as anti migrants sentiments.
The solution: is to maintain suitable migrants level that tensions over jobs, transports, housing and schools are at minimal. Its not the migrants fault but the gov. They opt not to invest in infrastructure despite collecting tax and fees from these migrants.

Some migrants are good because it can improve economy:
Citizens are employed at gov/mnc
PR Migrants are employed at sme
Temp migrants are employed at aged care
Student migrants are employed at hospitality
Asylum seekers are employed at agriculture

everyone has a job and it is important to control the numbers.